[usth/ICT2.2] Object Oriented Programming

README.md

@@ -2,21 +2,22 @@
 
 Bài tập luyện tập thi Olympic, học sinh giỏi Tin học, trong đó:
 
-|         Thư mục        |                   Nguồn đề bài                    |
-| ---------------------- | ------------------------------------------------- |
-| `09`, `10`, `11`, `12` | Đề thi, kiểm tra phân theo lớp                    |
-| `COCI`                 | [Giải Tin học Croatia mở rộng][0]                 |
-| `NTU`                  | [Đại học Nha Trang][1]                            |
-| `THT`                  | Hội thi Tin học trẻ                               |
-| `codechef`             | [Codechef][2]                                     |
-| `codeforces`           | [Codeforces][3]                                   |
-| `cpptour`              | A Tour of C++                                     |
-| `daily`                | [/r/dailyprogrammer][4]                           |
-| `others`               | Các đề bài không rõ nguồn                         |
-| `paip`                 | Paradigms of Artificial Intelligence Programming  |
-| `sicp`                 | Structure and Interpretation of Computer Programs |
-| `thinkperl6`           | Think Perl 6                                      |
-| `toys`                 | Programs that don't deserve their own repo        |
+|    Thư mục   |                      Nguồn đề bài                      |
+| ------------ | ------------------------------------------------------ |
+| `\d{2}`      | Đề thi, kiểm tra phân theo lớp                         |
+| `COCI`       | [Giải Tin học Croatia mở rộng][0]                      |
+| `NTU`        | [Đại học Nha Trang][1]                                 |
+| `THT`        | Hội thi Tin học trẻ                                    |
+| `codechef`   | [Codechef][2]                                          |
+| `codeforces` | [Codeforces][3]                                        |
+| `cpptour`    | A Tour of C++                                          |
+| `daily`      | [/r/dailyprogrammer][4]                                |
+| `others`     | Các đề bài không rõ nguồn                              |
+| `paip`       | Paradigms of Artificial Intelligence Programming       |
+| `sicp`       | Structure and Interpretation of Computer Programs      |
+| `thinkperl6` | Think Perl 6                                           |
+| `toys`       | Programs that don't deserve their own repo             |
+| `usth`       | L'Université des Sciences et des Technologies de Hanoï |
 
 [0]: http://www.hsin.hr/coci/
 [1]: http://laptrinh.ntu.edu.vn/
@@ -34,6 +35,7 @@ Phiên bản các trình dịch sử dụng test:
 | ----------- | ------------------ |
 | C           | GNU GCC 4.9+       |
 | Common Lisp | SBCL 1.4.8+        |
+| Java        | OpenJDK 11+        |
 | Lua         | Lua 5.1+           |
 | Pascal      | Free Pascal 2.6.4+ |
 | Perl 6      | Rakudo 2018.12+    |

usth/ICT2.2/final/Member.java

@@ -0,0 +1,54 @@
+public class Member
+{
+  public static final String[] ROLES = {"leader", "club coordinator",
+                                        "keynote speaker of code sharing",
+                                        "product programmer"};
+
+  private String name;
+  private String time;
+  private int role;
+
+  public String getName()
+  {
+    return name;
+  }
+
+  public String getTime()
+  {
+    return time;
+  }
+
+  public int getRole()
+  {
+    return role;
+  }
+  
+  public void setName(String name)
+  {
+    this.name = name;
+  }
+  
+  public void setTime(String time)
+  {
+    this.time = time;
+  }
+  
+  public void setRole(int role) throws IllegalArgumentException
+  {
+    if (role < 0 || role > 3)
+      throw new IllegalArgumentException("invalid role number: " + role);
+    this.role = role;
+  }
+
+  public Member(String name, String time, int role)
+  {
+    setName(name);
+    setTime(time);
+    setRole(role);
+  }
+
+  public String toString()
+  {
+    return String.format("%s (%s), from %s", name, ROLES[role], time);
+  }
+}

usth/ICT2.2/final/Point.java

@@ -0,0 +1,43 @@
+// Immutable Point
+public class Point
+{
+  private double x;
+  private double y;
+
+  public Point(double x, double y)
+  {
+    this.x = x;
+    this.y = y;
+  }
+
+  public double getX()
+  {
+    return x;
+  }
+
+  public double getY()
+  {
+    return y;
+  }
+
+  public String toString()
+  {
+    return String.format("(%g, %g)", x, y);
+  }
+
+  public static Point add(Point a, Point b)
+  {
+    return new Point(a.getX() + b.getX(), a.getY() + b.getY());
+  }
+
+  public static Point subtract(Point a, Point b)
+  {
+    return new Point(a.getX() - b.getX(), a.getY() - b.getY());
+  }
+
+  public static double calDisEuclid(Point a, Point b)
+  {
+    var trans = Point.subtract(a, b);
+    return Math.sqrt(trans.getX()*trans.getX() + trans.getY()*trans.getY());
+  }
+}

usth/ICT2.2/final/Problem1.java

@@ -0,0 +1,15 @@
+import java.util.Scanner;
+
+class Problem1
+{
+  public static void main(String... args)
+  {
+    var scanner = new Scanner(System.in);
+    int n = scanner.nextInt();
+    for (int i = 1; i <= n; i += 2)
+      System.out.println(i);
+    if (n % 2 == 0)
+      n--;
+    System.out.println((n + 1) * (n + 1) / 4);
+  }
+}

usth/ICT2.2/final/Problem2.java

@@ -0,0 +1,22 @@
+import java.util.Scanner;
+
+class Problem2
+{
+  public static void main(String... args)
+  {
+    var scanner = new Scanner(System.in);
+    System.out.println(
+        "Please enter two numbers which are the coordinate of one point:");
+    var a = new Point(scanner.nextDouble(), scanner.nextDouble());
+    System.out.println(
+        "Please enter two numbers which are the coordinate of another point:");
+    var b = new Point(scanner.nextDouble(), scanner.nextDouble());
+
+    System.out.printf("First point: %s\nSecond point: %s\n", a, b);
+    // Vector would make a better name than Point
+    System.out.printf("Their sum: %s\nTheir difference: %s\n",
+                      Point.add(a, b), Point.subtract(a, b));
+    System.out.printf("The Euclidean distance between the two points: %s\n",
+                      Point.calDisEuclid(a, b));
+  }
+}

usth/ICT2.2/final/Problem3.java

@@ -0,0 +1,40 @@
+import java.util.ArrayList;
+import java.util.Scanner;
+
+class Problem3
+{
+  public static void main(String... args)
+  {
+    var scanner = new Scanner(System.in);
+    System.out.println("Number of members:");
+    int n = scanner.nextInt();
+
+    var members = new ArrayList<Member>();
+    for (int i = 0; i < n; ++i)
+      {
+        System.out.println("Member name: ");
+        String name = scanner.next();
+        System.out.println("Member joining time: ");
+        String time = scanner.next();
+        System.out.println("Member role number: ");
+        int role = scanner.nextInt();
+        members.add(new Member(name, time, role));
+      }
+
+    var reports = new ArrayList<Report>();
+    for (var m : members)
+      {
+        System.out.println(m);
+        System.out.println("Activity: ");
+        String act = scanner.next();
+        System.out.println("Rate: ");
+        int rate = scanner.nextInt();
+        reports.add(new Report(m.getName(), act, rate));
+      }
+
+    System.out.println("Members:");
+    members.forEach(System.out::println);
+    System.out.println("Activity reports:");
+    reports.forEach(System.out::println);
+  }
+}

usth/ICT2.2/final/Report.java

@@ -0,0 +1,18 @@
+public class Report
+{
+  String name;
+  String activity;
+  int rate;
+
+  public Report(String name, String act, int rate)
+  {
+    this.name = name;
+    this.activity = act;
+    this.rate = rate;
+  }
+
+  public String toString()
+  {
+    return String.format("%s: %s: %s", name, activity, rate);
+  }
+}

usth/ICT2.2/labwork/1/AllEqual.java

@@ -0,0 +1,10 @@
+import java.util.Arrays;
+
+class AllEqual
+{
+  public static void main(String... args)
+  {
+    String first = args[0];
+    System.out.println(Arrays.stream(args).allMatch(a -> (a.equals(first))));
+  }
+}

usth/ICT2.2/labwork/1/Binary.java

@@ -0,0 +1,14 @@
+class Binary
+{
+  public static void main(String... args)
+  {
+    int n = Integer.parseInt(args[0]);
+    String s = "";
+    while (n > 0)
+      {
+        s = (n % 2) + s;
+        n >>= 1;
+      }
+    System.out.println(s);
+  }
+}

usth/ICT2.2/labwork/1/Distance.java

@@ -0,0 +1,10 @@
+class Distance
+{
+  public static void main(String... args)
+  {
+    double x = Double.parseDouble(args[0]);
+    double y = Double.parseDouble(args[1]);
+    System.out.printf("The distance from (%g, %g) to origin is %g\n",
+                      x, y, Math.sqrt(x*x + y*y));
+  }
+}

usth/ICT2.2/labwork/1/FivePerLine.java

@@ -0,0 +1,11 @@
+class FivePerLine
+{
+  public static void main(String... args)
+  {
+    for (int i = 1000; i < 2000; ++i)
+      if (i % 5 < 4)
+        System.out.print(i + " ");
+      else
+        System.out.println(i);
+  }
+}

usth/ICT2.2/labwork/1/FunctionGrowth.java

@@ -0,0 +1,10 @@
+class FunctionGrowth
+{
+  public static void main(String... args)
+  {
+    System.out.println("ln n\tn\tn ln n\tn^2\tn^3\t2^n");
+    for (long n = 16; n < 3005; n <<= 1)
+      System.out.printf("%g\t%d\t%g\t%d\t%d\t%g\n", Math.log(n), n,
+                        n * Math.log(n), n*n, n*n*n, Math.pow(2, n));
+  }
+}

usth/ICT2.2/labwork/1/HelloWorld.java

@@ -0,0 +1,7 @@
+class HelloWorld
+{
+  public static void main(String... args)
+  {
+    System.out.println("Hello, World!");
+  }
+}

usth/ICT2.2/labwork/1/Hellos.java

@@ -0,0 +1,14 @@
+class Hellos
+{
+  private static final String[] TH = {"th", "st", "nd", "rd", "th",
+                                      "th", "th", "th", "th", "th"};
+
+  public static void main(String... args)
+  {
+    int n = Integer.parseInt(args[0]);
+    for (int i = 1; i <= n; ++i)
+      // Before one says this defeat the purpose of the section,
+      // the tertiary operator IS conditional.
+      System.out.println(i + TH[i % 100 / 10 == 1 ? 7 : i % 10] + " Hello");
+  }
+}

usth/ICT2.2/labwork/1/Kary.java

@@ -0,0 +1,22 @@
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+class Kary
+{ 
+  private static final char[] DIGITS = {'0', '1', '2', '3', '4', '5', '6', '7',
+                                        '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
+
+  public static void main(String... args)
+  { 
+    int n = Integer.parseInt(args[0]);
+    List<Character> result = new ArrayList<Character>();
+    for (int k = Integer.parseInt(args[1]); n > 0; n /= k)
+      result.add(DIGITS[n % k]);
+
+    Collections.reverse(result);
+    for (char d : result)
+      System.out.print(d);
+    System.out.println();
+  }
+}

usth/ICT2.2/labwork/1/RollLoadedDie.java

@@ -0,0 +1,10 @@
+import java.util.concurrent.ThreadLocalRandom;
+
+class RollLoadedDie
+{
+  public static void main(String... args)
+  {
+    int x = ThreadLocalRandom.current().nextInt(1, 9);
+    System.out.println((x < 6) ? x : 6);
+  }
+}

usth/ICT2.2/labwork/1/SpringSeason.java

@@ -0,0 +1,25 @@
+import java.time.LocalDate;
+import java.time.DateTimeException;
+
+class SpringSeason
+{
+  private static final LocalDate start = LocalDate.of(42, 3, 19);
+  private static final LocalDate end = LocalDate.of(42, 6, 21);
+
+  public static void main(String... args)
+  {
+    int m = Integer.parseInt(args[0]);
+    int d = Integer.parseInt(args[1]);
+    try
+      {
+        LocalDate query = LocalDate.of(42, m, d);
+        // Yes, I'm sorry for leaving it here.
+        // If only Java has the try-except-else like Python!
+        System.out.println(query.isAfter(start) && query.isBefore(end));
+      }
+    catch (DateTimeException e)
+      {
+        System.out.println(false);
+      }
+  }
+}

usth/ICT2.2/labwork/1/SumOfSines.java

@@ -0,0 +1,8 @@
+class SumOfSines
+{
+  public static void main(String... args)
+  {
+    double t = Double.parseDouble(args[0]);
+    System.out.printf("sin2t + sin3t = %g", Math.sin(t * 2) + Math.sin (t * 3));
+  }
+}

usth/ICT2.2/labwork/1/SumOfTwoDice.java

@@ -0,0 +1,13 @@
+import java.util.concurrent.ThreadLocalRandom;
+
+class SumOfTwoDice
+{
+  public static void main(String... args)
+  {
+    int x = ThreadLocalRandom.current().nextInt(1, 7);
+    System.out.println("First roll: " + x);
+    int y = ThreadLocalRandom.current().nextInt(1, 7);
+    System.out.println("Second roll: " + y);
+    System.out.println("Sum: " + (x + y));
+  }
+}

usth/ICT2.2/labwork/1/TenHelloWorld.java

@@ -0,0 +1,8 @@
+class TenHelloWorld
+{
+  public static void main(String... args)
+  {
+    for (int i = 0; i < 10; ++i)
+      System.out.println("Hello, World!");
+  }
+}

usth/ICT2.2/labwork/1/UseArguments.java

@@ -0,0 +1,7 @@
+class UseArguments
+{
+  public static void main(String... args)
+  {
+    System.out.printf("Hi %s.  How are you?\n", args[0]);
+  }
+}

usth/ICT2.2/labwork/1/UseThree.java

@@ -0,0 +1,8 @@
+class UseThree
+{
+  public static void main(String... args)
+  {
+    System.out.printf("Hi %s, %s and %s.  How are you?\n",
+                      args[2], args[1], args[0]);
+  }
+}

usth/ICT2.2/labwork/1/logic-xor-table.md

@@ -0,0 +1,8 @@
+# Logical Exclusive Or Table
+
+|   a   |   b   | a ^ b |
+| ----- | ----- | ----- |
+| false | false | false |
+| false | true  | true  |
+| true  | false | true  |
+| true  | true  | false |

usth/ICT2.2/labwork/1/string-concat.md

@@ -0,0 +1,15 @@
+# String Concatenation
+
+To quote the [official Java documentation](https://docs.oracle.com/javase/8/docs/api/java/lang/String.html):
+
+> The Java language provides special support for the string concatenation
+> operator (`+`), and for conversion of other objects to strings.  [...]
+> String conversions are implemented through the method `toString`, defined
+> by Object and inherited by all classes in Java.
+
+Thus the numbers (e.g. 2, 2 + 3 = 5) are converted to their strings
+representations ("2", "5") and concatenated to the string.  Since `+` is
+operated from left to right,
+
+    2 + 3 + "bc" = 5 + "bc" = "5" + "bc" = "5bc"
+    "bc" + 2 + 3 = "bc" + "2" + 3 = "bc2" + 3 = "bc2" + "3" = "bc23"

usth/ICT2.2/labwork/2/README.md

@@ -0,0 +1,18 @@
+# Build with Maven
+
+Following the official guide [Maven in 5 Minutes](https://maven.apache.org/guides/getting-started/maven-in-five-minutes.html):
+
+1. Create a project named `my-app`:
+
+        mvn archetype:generate -DgroupId=com.mycompany.app -DartifactId=my-app -DarchetypeArtifactId=maven-archetype-quickstart -DarchetypeVersion=1.4 -DinteractiveMode=false
+
+2. Change into the project directory: `cd my-app`
+3. Build the project: `mvn package`
+
+Extra exercises for labwork 1 are written in `src/main/java/com/mycompany/app/`
+inside `my-app`.  To launch a class named `App` for example, run
+
+    java -cp my-app/target/my-app-1.0-SNAPSHOT.jar com.mycompany.app.App
+
+I find this build method to be overcomplicated for 5-minute throw-away programs
+and decide not to use it in the upcoming labworks.

usth/ICT2.2/labwork/2/my-app/pom.xml

@@ -0,0 +1,75 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>com.mycompany.app</groupId>
+  <artifactId>my-app</artifactId>
+  <version>1.0-SNAPSHOT</version>
+
+  <name>my-app</name>
+  <!-- FIXME change it to the project's website -->
+  <url>http://www.example.com</url>
+
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    <maven.compiler.source>1.8</maven.compiler.source>
+    <maven.compiler.target>1.8</maven.compiler.target>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>4.11</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
+      <plugins>
+        <!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
+        <plugin>
+          <artifactId>maven-clean-plugin</artifactId>
+          <version>3.1.0</version>
+        </plugin>
+        <!-- default lifecycle, jar packaging: see https://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
+        <plugin>
+          <artifactId>maven-resources-plugin</artifactId>
+          <version>3.0.2</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-compiler-plugin</artifactId>
+          <version>3.8.0</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-surefire-plugin</artifactId>
+          <version>2.22.1</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-jar-plugin</artifactId>
+          <version>3.0.2</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-install-plugin</artifactId>
+          <version>2.5.2</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-deploy-plugin</artifactId>
+          <version>2.8.2</version>
+        </plugin>
+        <!-- site lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#site_Lifecycle -->
+        <plugin>
+          <artifactId>maven-site-plugin</artifactId>
+          <version>3.7.1</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-project-info-reports-plugin</artifactId>
+          <version>3.0.0</version>
+        </plugin>
+      </plugins>
+    </pluginManagement>
+  </build>
+</project>

usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/App.java

@@ -0,0 +1,9 @@
+package com.mycompany.app;
+
+public class App
+{
+  public static void main(String... args)
+  {
+    System.out.println("Hello World!");
+  }
+}

usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/Beers.java

@@ -0,0 +1,17 @@
+package com.mycompany.app;
+
+// Exercise 4
+public class Beers
+{
+  public static void main(String... args)
+  {
+    for (int i = 9; i > 1; --i)
+      System.out.printf(
+        "%d bottles of beer we are going to drink, %d bottles of beer.\n"
+        + "Now try to drink one, drink one,\n", i, i);
+    System.out.print(
+      "1 bottle of beer we are going to drink, 1 bottle of beer.\n"
+      + "Now try to drink one, drink one,\n"
+      + "Oh no, no bottles of beer to drink now.\n");
+  }
+}

usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/IsLeapYear.java

@@ -0,0 +1,14 @@
+package com.mycompany.app;
+
+// Exercise 7
+public class IsLeapYear
+{
+  public static void main(String... args)
+  {
+    int n = Integer.parseInt(args[0]);
+    if (n % 4 == 0 && n % 100 != 0 || n % 400 == 0)
+      System.out.printf("%d is a leap year\n", n);
+    else
+      System.out.printf("%d is not a leap year\n", n);
+  }
+}

usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/Linear.java

@@ -0,0 +1,12 @@
+package com.mycompany.app;
+
+// Exercise 5
+public class Linear
+{
+  public static void main(String... args)
+  {
+    double a = Double.parseDouble(args[0]);
+    double b = Double.parseDouble(args[1]);
+    System.out.println(-b / a);
+  }
+}

usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/MeanSTD.java

@@ -0,0 +1,17 @@
+package com.mycompany.app;
+
+import java.util.Arrays;
+
+// Exercise 8
+public class MeanSTD
+{
+  public static void main(String... args)
+  {
+    double n = args.length;
+    double m = Arrays.stream(args).mapToDouble(Double::parseDouble).sum() / n;
+    double s = Math.sqrt(
+      Arrays.stream(args)
+      .mapToDouble(x -> Math.pow(Double.parseDouble(x) - m, 2)).sum() / n);
+    System.out.printf("Mean: %f\nStandard deviation: %f\n", m, s);
+  }
+}

usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/Quadratic.java

@@ -0,0 +1,24 @@
+package com.mycompany.app;
+
+// Exercise 6
+public class Quadratic
+{
+  public static void main(String... args)
+  {
+    double a = Double.parseDouble(args[0]);
+    double b = Double.parseDouble(args[1]);
+    double c = Double.parseDouble(args[2]);
+    // assume ax^2 + bx + c = 0 is a valid quadratic equation
+    double d = b*b - a*c*4;
+    if (d < 0)
+      {
+        System.out.printf("%f + %fj\n", -b/a/2, Math.sqrt(-d)/a/2);
+        System.out.printf("%f + %fj\n", -b/a/2, -Math.sqrt(-d)/a/2);
+      }
+    else
+      {
+        System.out.println(-b/a/2 + Math.sqrt(d)/a/2);
+        System.out.println(-b/a/2 - Math.sqrt(d)/a/2);
+      }
+  }
+}

usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/RandRange.java

@@ -0,0 +1,13 @@
+package com.mycompany.app;
+
+import java.util.concurrent.ThreadLocalRandom;
+
+// Exercise 3
+class RandRange
+{
+  public static void main(String... args)
+  {
+    System.out.println(
+      ThreadLocalRandom.current().nextInt(0, Integer.parseInt(args[0])));
+  }
+}

usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/TenHellos.java

@@ -0,0 +1,10 @@
+package com.mycompany.app;
+
+public class TenHellos
+{
+  public static void main(String... args)
+  {
+    for (int i = 0; i < 10; ++i)
+      System.out.println("Hello, World!");
+  }
+}

usth/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/UseThree.java

@@ -0,0 +1,11 @@
+package com.mycompany.app;
+
+// Exercise 2
+class UseThree
+{
+  public static void main(String... args)
+  {
+    System.out.printf("Hi %s, %s and %s.  How are you?\n",
+                      args[2], args[1], args[0]);
+  }
+}

usth/ICT2.2/labwork/2/my-app/src/test/java/com/mycompany/app/AppTest.java

@@ -0,0 +1,16 @@
+package com.mycompany.app;
+
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+// Unit test for simple App.
+public class AppTest 
+{
+  // Rigorous Test :-)
+  @Test
+  public void shouldAnswerWithTrue()
+  {
+    assertTrue( true );
+  }
+}

usth/ICT2.2/labwork/2/my-app/target/maven-archiver/pom.properties

@@ -0,0 +1,4 @@
+#Created by Apache Maven 3.6.2
+groupId=com.mycompany.app
+artifactId=my-app
+version=1.0-SNAPSHOT

usth/ICT2.2/labwork/2/my-app/target/maven-status/maven-compiler-plugin/compile/default-compile/createdFiles.lst

@@ -0,0 +1,9 @@
+com/mycompany/app/App.class
+com/mycompany/app/UseThree.class
+com/mycompany/app/Linear.class
+com/mycompany/app/TenHellos.class
+com/mycompany/app/MeanSTD.class
+com/mycompany/app/RandRange.class
+com/mycompany/app/Beers.class
+com/mycompany/app/IsLeapYear.class
+com/mycompany/app/Quadratic.class

usth/ICT2.2/labwork/2/my-app/target/maven-status/maven-compiler-plugin/compile/default-compile/inputFiles.lst

@@ -0,0 +1,9 @@
+/home/cnx/Documents/B2/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/Quadratic.java
+/home/cnx/Documents/B2/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/IsLeapYear.java
+/home/cnx/Documents/B2/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/App.java
+/home/cnx/Documents/B2/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/RandRange.java
+/home/cnx/Documents/B2/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/Beers.java
+/home/cnx/Documents/B2/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/Linear.java
+/home/cnx/Documents/B2/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/TenHellos.java
+/home/cnx/Documents/B2/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/MeanSTD.java
+/home/cnx/Documents/B2/ICT2.2/labwork/2/my-app/src/main/java/com/mycompany/app/UseThree.java

usth/ICT2.2/labwork/2/my-app/target/maven-status/maven-compiler-plugin/testCompile/default-testCompile/createdFiles.lst

@@ -0,0 +1 @@
+com/mycompany/app/AppTest.class

usth/ICT2.2/labwork/2/my-app/target/maven-status/maven-compiler-plugin/testCompile/default-testCompile/inputFiles.lst

@@ -0,0 +1 @@
+/home/cnx/Documents/B2/ICT2.2/labwork/2/my-app/src/test/java/com/mycompany/app/AppTest.java

usth/ICT2.2/labwork/2/my-app/target/surefire-reports/TEST-com.mycompany.app.AppTest.xml

@@ -0,0 +1,60 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<testsuite xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="https://maven.apache.org/surefire/maven-surefire-plugin/xsd/surefire-test-report.xsd" name="com.mycompany.app.AppTest" time="0.019" tests="1" errors="0" skipped="0" failures="0">
+  <properties>
+    <property name="awt.toolkit" value="sun.awt.X11.XToolkit"/>
+    <property name="java.specification.version" value="11"/>
+    <property name="sun.cpu.isalist" value=""/>
+    <property name="sun.jnu.encoding" value="UTF-8"/>
+    <property name="java.class.path" value="/home/cnx/Documents/B2/ICT2.2/labwork/2/my-app/target/test-classes:/home/cnx/Documents/B2/ICT2.2/labwork/2/my-app/target/classes:/home/cnx/.m2/repository/junit/junit/4.11/junit-4.11.jar:/home/cnx/.m2/repository/org/hamcrest/hamcrest-core/1.3/hamcrest-core-1.3.jar:"/>
+    <property name="java.vm.vendor" value="Debian"/>
+    <property name="sun.arch.data.model" value="64"/>
+    <property name="java.vendor.url" value="https://tracker.debian.org/openjdk-11"/>
+    <property name="user.timezone" value=""/>
+    <property name="java.vm.specification.version" value="11"/>
+    <property name="os.name" value="Linux"/>
+    <property name="sun.java.launcher" value="SUN_STANDARD"/>
+    <property name="user.country" value="US"/>
+    <property name="sun.boot.library.path" value="/usr/lib/jvm/java-11-openjdk-amd64/lib"/>
+    <property name="sun.java.command" value="/home/cnx/Documents/B2/ICT2.2/labwork/2/my-app/target/surefire/surefirebooter4171187558944627507.jar /home/cnx/Documents/B2/ICT2.2/labwork/2/my-app/target/surefire 2019-10-09T17-47-23_851-jvmRun1 surefire1053437032396327338tmp surefire_014762799941833427558tmp"/>
+    <property name="jdk.debug" value="release"/>
+    <property name="surefire.test.class.path" value="/home/cnx/Documents/B2/ICT2.2/labwork/2/my-app/target/test-classes:/home/cnx/Documents/B2/ICT2.2/labwork/2/my-app/target/classes:/home/cnx/.m2/repository/junit/junit/4.11/junit-4.11.jar:/home/cnx/.m2/repository/org/hamcrest/hamcrest-core/1.3/hamcrest-core-1.3.jar:"/>
+    <property name="sun.cpu.endian" value="little"/>
+    <property name="user.home" value="/home/cnx"/>
+    <property name="user.language" value="en"/>
+    <property name="java.specification.vendor" value="Oracle Corporation"/>
+    <property name="java.version.date" value="2019-10-15"/>
+    <property name="java.home" value="/usr/lib/jvm/java-11-openjdk-amd64"/>
+    <property name="file.separator" value="/"/>
+    <property name="basedir" value="/home/cnx/Documents/B2/ICT2.2/labwork/2/my-app"/>
+    <property name="java.vm.compressedOopsMode" value="32-bit"/>
+    <property name="line.separator" value="&#10;"/>
+    <property name="java.specification.name" value="Java Platform API Specification"/>
+    <property name="java.vm.specification.vendor" value="Oracle Corporation"/>
+    <property name="java.awt.graphicsenv" value="sun.awt.X11GraphicsEnvironment"/>
+    <property name="surefire.real.class.path" value="/home/cnx/Documents/B2/ICT2.2/labwork/2/my-app/target/surefire/surefirebooter4171187558944627507.jar"/>
+    <property name="sun.management.compiler" value="HotSpot 64-Bit Tiered Compilers"/>
+    <property name="java.runtime.version" value="11.0.5-ea+6-post-Debian-2"/>
+    <property name="user.name" value="cnx"/>
+    <property name="path.separator" value=":"/>
+    <property name="os.version" value="4.19.0-5-amd64"/>
+    <property name="java.runtime.name" value="OpenJDK Runtime Environment"/>
+    <property name="file.encoding" value="UTF-8"/>
+    <property name="java.vm.name" value="OpenJDK 64-Bit Server VM"/>
+    <property name="localRepository" value="/home/cnx/.m2/repository"/>
+    <property name="java.vendor.url.bug" value="https://bugs.debian.org/openjdk-11"/>
+    <property name="java.io.tmpdir" value="/tmp"/>
+    <property name="java.version" value="11.0.5-ea"/>
+    <property name="user.dir" value="/home/cnx/Documents/B2/ICT2.2/labwork/2/my-app"/>
+    <property name="os.arch" value="amd64"/>
+    <property name="java.vm.specification.name" value="Java Virtual Machine Specification"/>
+    <property name="java.awt.printerjob" value="sun.print.PSPrinterJob"/>
+    <property name="sun.os.patch.level" value="unknown"/>
+    <property name="java.library.path" value="/usr/java/packages/lib:/usr/lib/x86_64-linux-gnu/jni:/lib/x86_64-linux-gnu:/usr/lib/x86_64-linux-gnu:/usr/lib/jni:/lib:/usr/lib"/>
+    <property name="java.vendor" value="Debian"/>
+    <property name="java.vm.info" value="mixed mode, sharing"/>
+    <property name="java.vm.version" value="11.0.5-ea+6-post-Debian-2"/>
+    <property name="sun.io.unicode.encoding" value="UnicodeLittle"/>
+    <property name="java.class.version" value="55.0"/>
+  </properties>
+  <testcase name="shouldAnswerWithTrue" classname="com.mycompany.app.AppTest" time="0.001"/>
+</testsuite>

usth/ICT2.2/labwork/2/my-app/target/surefire-reports/com.mycompany.app.AppTest.txt

@@ -0,0 +1,4 @@
+-------------------------------------------------------------------------------
+Test set: com.mycompany.app.AppTest
+-------------------------------------------------------------------------------
+Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.019 s - in com.mycompany.app.AppTest

usth/ICT2.2/labwork/3/C++/README.md

@@ -0,0 +1,10 @@
+# Labwork 3: Implementations in C++
+
+At this point I've come to realized that like Thanos, C++ is inevitable.
+Despite my disgust toward the language (TBH I don't like Java any better),
+I need to know it enough, at least at the read-only level.
+
+Compilation of tests could be done as follows (on Unix-like system of course,
+since poor Windows users don't even have a standard C/C++ compiler):
+
+    c++ <classname>*.cc

usth/ICT2.2/labwork/3/C++/automobile.cc

@@ -0,0 +1,56 @@
+#include <regex>
+#include <stdexcept>
+#include <string>
+
+#include "automobile.h"
+
+using namespace std;
+
+const regex license_pattern ("[0-9A-Z]+");
+
+void
+Automobile::set_license (string s)
+{
+  smatch m;
+  if (!regex_match (s, m, license_pattern))
+    throw invalid_argument{"invalid license plate"};
+  license = s;
+}
+
+void
+Automobile::set_fuel (double x)
+{
+  if (x < 0)
+    throw invalid_argument{"negative fuel"};
+  fuel = x;
+}
+
+void
+Automobile::set_speed (double x)
+{
+  speed = (x < 0) ? 0 : x;
+}
+
+Automobile::Automobile (string l, double f, double s)
+{
+  set_license (l);
+  set_fuel (f);
+  set_speed (s);
+}
+
+void
+Automobile::accelerate (double v)
+{
+  if (v < 0)
+    throw invalid_argument{"negative acceleration"};
+  if (fuel)
+    set_speed (speed + v);
+}
+
+void
+Automobile::decelerate (double v)
+{
+  if (v < 0)
+    throw invalid_argument{"negative deceleration"};
+  set_speed (speed - v);
+}

usth/ICT2.2/labwork/3/C++/automobile.h

@@ -0,0 +1,20 @@
+#include <string>
+
+using namespace std;
+
+class Automobile
+{
+  double fuel;
+  double speed;
+  string license;
+public:
+  Automobile (string, double, double);
+  string get_license () { return license; }
+  double get_fuel () { return fuel; }
+  double get_speed () { return speed; }
+  void set_license (string);
+  void set_fuel (double);
+  void set_speed (double);
+  void accelerate (double);
+  void decelerate (double);
+};

usth/ICT2.2/labwork/3/C++/button-test.cc

@@ -0,0 +1,14 @@
+#include <iostream>
+
+#include "button.h"
+
+using namespace std;
+
+int
+main ()
+{
+  Button butt ("foo", "bar");
+  butt.depress ();
+  butt.undepress ();
+  cout << "button " << butt.label << " color " << butt.color << endl;
+}

usth/ICT2.2/labwork/3/C++/button.h

@@ -0,0 +1,14 @@
+#include <string>
+
+using namespace std;
+
+class Button
+{
+  bool state;
+public:
+  string label;
+  string color;
+  Button (string l, string c) : label {l}, color {c}, state {false} {}
+  void depress () { state = true; }
+  void undepress () { state = false; }
+};

usth/ICT2.2/labwork/3/C++/cow-test.cc

@@ -0,0 +1,9 @@
+#include "cow.h"
+
+int
+main ()
+{
+  Cow cow ("foo", "bar", 7);
+  cow.age = -4;   // some casting happens here
+  cow.moo ();
+}

usth/ICT2.2/labwork/3/C++/cow.cc

@@ -0,0 +1,11 @@
+#include <iostream>
+
+#include "cow.h"
+
+using namespace std;
+
+void
+Cow::moo ()
+{
+  cout << "Moo...!" << endl;
+}

usth/ICT2.2/labwork/3/C++/cow.h

@@ -0,0 +1,17 @@
+#include <string>
+
+using namespace std;
+
+class Cow
+{
+  // The reason these have private access
+  // is that their no way a cow's name and breed can be changed.
+  string name;
+  string breed;
+public:
+  unsigned age;
+
+  Cow (string n, string b, unsigned a) : name {n}, breed {b}, age {a} {}
+  Cow (string n, string b) : name {n}, breed {b}, age {0} {}
+  void moo ();
+};

usth/ICT2.2/labwork/3/C++/name-card-test.cc

@@ -0,0 +1,14 @@
+#include <iostream>
+
+#include "name-card.h"
+
+using namespace std;
+
+int
+main ()
+{
+  NameCard card ("Foobar Baz", "420-69", "foo@bar.baz");
+  cout << "Name: " << card.get_name () << endl
+       << "Phone: " << card.get_phone () << endl
+       << "Email: " << card.get_email () << endl;
+}

usth/ICT2.2/labwork/3/C++/name-card.cc

@@ -0,0 +1,47 @@
+#include <regex>
+#include <stdexcept>
+#include <string>
+
+#include "name-card.h"
+
+using namespace std;
+
+const regex name_pattern ("[ A-Za-z]+");
+const regex phone_pattern ("[-0-9]+");
+// This should be good enough I guess?
+const regex email_pattern ("(\\w+)(\\.|_)?(\\w*)@(\\w+)(\\.(\\w+))+");
+
+void
+NameCard::set_name (string s)
+{
+  // I miss Raku so much
+  smatch m;
+  if (!regex_match (s, m, name_pattern))
+    throw invalid_argument{"invalid name"};
+  name = s;
+}
+
+void
+NameCard::set_phone (string s)
+{
+  smatch m;
+  if (!regex_match (s, m, phone_pattern))
+    throw invalid_argument{"invalid number"};
+  phone = s;
+}
+
+void
+NameCard::set_email (string s)
+{
+  smatch m;
+  if (!regex_match (s, m, email_pattern))
+    throw invalid_argument{"invalid name"};
+  email = s;
+}
+
+NameCard::NameCard (string n, string p, string e)
+{
+  set_name (n);
+  set_phone (p);
+  set_email (e);
+}

usth/ICT2.2/labwork/3/C++/name-card.h

@@ -0,0 +1,18 @@
+#include <string>
+
+using namespace std;
+
+class NameCard
+{
+  string name;
+  string phone;
+  string email;
+public:
+  string get_name () { return name; }
+  string get_phone () { return phone; }
+  string get_email () { return email; }
+  void set_name (string);
+  void set_phone (string);
+  void set_email (string);
+  NameCard (string, string, string);
+};

usth/ICT2.2/labwork/3/C++/shopping-cart-test.cc

@@ -0,0 +1,19 @@
+#include <iostream>
+
+#include "shopping-cart.h"
+
+using namespace std;
+
+int
+main ()
+{
+  ShoppingCart cart;
+  cart.add_to_cart ("foo");
+  cart.add_to_cart ("foo");
+  cart.add_to_cart ("bar");
+  cart.remove_from_cart ("baz");
+  cout << cart.count ("foo") << ' '
+       << cart.count ("bar") << ' '
+       << cart.count ("baz") << endl;
+  cart.check_out ();
+}

usth/ICT2.2/labwork/3/C++/shopping-cart.h

@@ -0,0 +1,16 @@
+#include <string>
+#include <unordered_map>
+
+using namespace std;
+
+class ShoppingCart
+{
+  // quite of an improvement over the Java version
+  unordered_map<string, int> contents;
+public:
+  void add_to_cart (string item) { contents[item]++; }
+  void remove_from_cart (string item) { contents[item] = 0; }
+  // to make this class useful anyhow
+  int count (string item) { return contents[item]; }
+  void check_out () { contents.clear (); }
+};

usth/ICT2.2/labwork/3/C++/vector-test.cc

@@ -0,0 +1,20 @@
+#include <iostream>
+
+#include "vector.h"
+
+using namespace std;
+
+int
+main ()
+{
+  Vector u (4, 20);
+  Vector v (6, 9);
+  cout << "u = (" << u.x << ", " << u.y << ")" << endl;
+  cout << "v = (" << v.x << ", " << v.y << ")" << endl;
+  Vector w {u + v};
+  cout << "u + v = (" << w.x << ", " << w.y << ")" << endl;
+  w = u - v;
+  cout << "u - v = (" << w.x << ", " << w.y << ")" << endl;
+  w = u * v;
+  cout << "u * v = (" << w.x << ", " << w.y << ")" << endl;
+}

usth/ICT2.2/labwork/3/C++/vector.cc

@@ -0,0 +1,19 @@
+#include "vector.h"
+
+Vector
+operator+ (Vector u, Vector v)
+{
+  return u += v;
+}
+
+Vector
+operator- (Vector u, Vector v)
+{
+  return u -= v;
+}
+
+Vector
+operator* (Vector u, Vector v)
+{
+  return u *= v;
+}

usth/ICT2.2/labwork/3/C++/vector.h

@@ -0,0 +1,17 @@
+class Vector
+{
+public:
+  int x;
+  int y;
+
+  Vector (int ex, int why) : x {ex}, y {why} {}
+  Vector () : x {0}, y{0} {}
+
+  Vector& operator+= (Vector v) { x += v.x, y += v.y; return *this; }
+  Vector& operator-= (Vector v) { x -= v.x, y -= v.y; return *this; }
+  Vector& operator*= (Vector v) { x *= v.x, y *= v.y; return *this; }
+};
+
+Vector operator+ (Vector, Vector);
+Vector operator- (Vector, Vector);
+Vector operator* (Vector, Vector);

usth/ICT2.2/labwork/3/Java/Automobile.java

@@ -0,0 +1,68 @@
+import java.util.regex.Pattern;
+
+class Automobile
+{
+  private static final Pattern licensePattern = Pattern.compile("[0-9A-Z]+");
+  private double fuel;
+  private double speed;
+  private String license;
+
+  public double getFuel()
+  {
+    return fuel;
+  }
+
+  public double getSpeed()
+  {
+    return speed;
+  }
+
+  public String getLicense()
+  {
+    return license;
+  }
+
+  public void setFuel(double fuel)
+  {
+    if (fuel < 0)
+      throw new IllegalArgumentException(
+        "fuel must be nonnegative, instead got " + fuel);
+    this.fuel = fuel;
+  }
+
+  public void setSpeed(double speed)
+  {
+    this.speed = Math.max(0, speed);
+  }
+
+  public void setLicense(String license)
+  {
+    if (!licensePattern.matcher(license).matches())
+      throw new IllegalArgumentException("invalid license: " + license);
+    this.license = license;
+  }
+
+  public Automobile(double f, double s, String l)
+  {
+    setFuel(f);
+    setSpeed(s);
+    setLicense(l);
+  }
+
+  public void accelerate(double v)
+  {
+    if (v < 0)
+      throw new IllegalArgumentException(
+        "acceleration must be nonnegative, instead got " + v);
+    if (fuel > 0)
+      setSpeed(speed + v);
+  }
+
+  public void decelerate(double v)
+  {
+    if (v < 0)
+      throw new IllegalArgumentException(
+        "deceleration must be nonnegative, instead got " + v);
+    setSpeed(speed - v);
+  }
+}

usth/ICT2.2/labwork/3/Java/Button.java

@@ -0,0 +1,50 @@
+public class Button
+{
+  private String label;
+  private String color;
+  private boolean state;
+
+  public Button(String label, String color)
+  {
+    this.label = label;
+    this.color = color;
+    this.state = false;
+  }
+
+  public String toString()
+  {
+    return String.format("<button %s with color %s and state %s>",
+                         label, color, state);
+  }
+
+  // To be honest these getters and setters are really redundant in this case
+  public String getLabel()
+  {
+    return label;
+  }
+
+  public String getColor()
+  {
+    return color;
+  }
+
+  public void setLabel(String label)
+  {
+    this.label = label;
+  }
+
+  public void setColor(String color)
+  {
+    this.color = color;
+  }
+
+  public void dePress()
+  {
+    this.state = true;
+  }
+
+  public void unDepress()
+  {
+    this.state = false;
+  }
+}

usth/ICT2.2/labwork/3/Java/ButtonTest.java

@@ -0,0 +1,12 @@
+class ButtonTest
+{
+  public static void main(String... args)
+  {
+    Button button = new Button("foo", "bar");
+    System.out.println(button);
+    button.setLabel("fu");
+    button.setColor("baz");
+    button.dePress();
+    System.out.println(button);
+  }
+}

usth/ICT2.2/labwork/3/Java/Cow.java

@@ -0,0 +1,36 @@
+public class Cow
+{
+  private String name;
+  private String breed;
+  private int age;
+
+  public Cow(String name, String breed)
+  {
+    this(name, breed, 0);
+  }
+
+  public Cow(String name, String breed, int age)
+  {
+    this.name = name;
+    this.breed = breed;
+    setAge(age);
+  }
+
+  public static void moo()
+  {
+    System.out.println("Moo...!");
+  }
+
+  public int getAge()
+  {
+    return age;
+  }
+
+  public void setAge(int age)
+  {
+    if (age < 0)
+      throw new IllegalArgumentException(
+        "age must be nonnegative, instead got " + age);
+    this.age = age;
+  }
+}

usth/ICT2.2/labwork/3/Java/CowTest.java

@@ -0,0 +1,9 @@
+class CowTest   // there's no reason to import a test what-so-ever
+{
+  public static void main(String... args)
+  {
+    Cow cow = new Cow("foo", "bar", 7);
+    cow.setAge(-4);
+    cow.moo();
+  }
+}

usth/ICT2.2/labwork/3/Java/NameCard.java

@@ -0,0 +1,67 @@
+import java.util.regex.Pattern;
+
+public class NameCard
+{
+  private static final Pattern namePattern = Pattern.compile("[ A-Za-z]+");
+  private static final Pattern phonePattern = Pattern.compile("[-0-9]*");
+  // I have not learnt regex properly
+  private static final Pattern emailPattern = Pattern.compile(
+    "(\\w+)(\\.|_)?(\\w*)@(\\w+)(\\.(\\w+))+");
+
+  private String name;
+  private String phone;
+  private String email;
+
+  public String getName()
+  {
+    return name;
+  }
+
+  public String getPhone()
+  {
+    return phone;
+  }
+
+  public String getEmail()
+  {
+    return email;
+  }
+
+  public void setName(String name)
+  {
+    if (!namePattern.matcher(name).matches())
+      throw new IllegalArgumentException("invalid name: " + name);
+    this.name = name;
+  }
+
+  public void setPhone(String phone)
+  {
+    if (!phonePattern.matcher(phone).matches())
+      throw new IllegalArgumentException("invalid phone number: " + phone);
+    this.phone = phone;
+  }
+
+  public void setEmail(String email)
+  {
+    if (!emailPattern.matcher(email).matches())
+      throw new IllegalArgumentException("invalid email: " + email);
+    this.email = email;
+  }
+
+  public NameCard(String name)
+  {
+    this(name, "", "");
+  }
+
+  public NameCard(String name, String phone)
+  {
+    this(name, phone, "");
+  }
+
+  public NameCard(String name, String phone, String email)
+  {
+    setName(name);
+    setPhone(phone);
+    setEmail(email);
+  }
+}

usth/ICT2.2/labwork/3/Java/NameCardTest.java

@@ -0,0 +1,9 @@
+class NameCardTest
+{
+  public static void main(String... args)
+  {
+    NameCard card = new NameCard("Foobar Baz", "420-69", "foo@bar.baz");
+    System.out.printf("Name: %s\nPhone: %s\nEmail: %s\n",
+                      card.getName(), card.getPhone(), card.getEmail());
+  }
+}

usth/ICT2.2/labwork/3/Java/README.md

@@ -0,0 +1,10 @@
+# Labwork 3: Implementations in Java
+
+For the ease of typing, the test files are named `<classname>Test.java`
+instead of `<classname>TestDrive.java`.
+To rename them to the original requirement, use Perl `rename` and GNU `sed`
+
+```sh
+rename s/Test/TestDrive/ *Test.java
+sed -i s/Test/TestDrive/ *TestDrive.java
+```

usth/ICT2.2/labwork/3/Java/ShoppingCart.java

@@ -0,0 +1,27 @@
+import java.util.ArrayList;
+import java.util.List;
+
+public class ShoppingCart
+{
+  private List<String> cartContents = new ArrayList<String>();
+
+  public boolean addToCart(String content)
+  {
+    return cartContents.add(content);
+  }
+
+  public boolean removeFromCart(String content)
+  {
+    return cartContents.remove(content);
+  }
+
+  public void checkOut()
+  {
+    cartContents.clear();
+  }
+
+  public String toString()
+  {
+    return "Cart content(s): " + String.join(", ", cartContents);
+  }
+}

usth/ICT2.2/labwork/3/Java/ShoppingCartTest.java

@@ -0,0 +1,16 @@
+class ShoppingCartTest
+{
+  public static void main(String... args)
+  {
+    ShoppingCart cart = new ShoppingCart();
+    System.out.println(cart);
+    cart.addToCart("foo");
+    cart.addToCart("bar");
+    cart.addToCart("baz");
+    System.out.println(cart);
+    cart.removeFromCart("bar");
+    System.out.println(cart);
+    cart.checkOut();
+    System.out.println(cart);
+  }
+}

usth/ICT2.2/labwork/3/Java/Vector.java

@@ -0,0 +1,39 @@
+public class Vector
+{
+  // There's nothing to validate
+  public int x;
+  public int y;
+
+  public Vector()
+  {
+    this(0, 0);
+  }
+
+  public Vector(int x, int y)
+  {
+    this.x = x;
+    this.y = y;
+  }
+
+  public String toString()
+  {
+    // I feel bad writing this
+    return "(" + x + ", " + y + ")";
+  }
+
+  public Vector add(Vector other)
+  {
+    return new Vector(this.x + other.x, this.y + other.y);
+  }
+
+  public Vector subtract(Vector other)
+  {
+    return new Vector(this.x - other.x, this.y - other.y);
+  }
+
+  public Vector multiply(Vector other)
+  {
+    // instruction unclear, applying element-wise multiplication
+    return new Vector(this.x * other.x, this.y * other.y);
+  }
+}

usth/ICT2.2/labwork/3/Java/VectorTest.java

@@ -0,0 +1,10 @@
+class VectorTest
+{
+  public static void main(String... args)
+  {
+    Vector u = new Vector(4, 20);
+    Vector v = new Vector(6, 9);
+    System.out.printf("u = %s\nv = %s\nu + v = %s\nu - v = %s\nu * v = %s\n",
+                      u, v, u.add(v), u.subtract(v), u.multiply(v));
+  }
+}

usth/ICT2.2/labwork/4/BubbleSort.java

@@ -0,0 +1,21 @@
+import java.util.ArrayList;
+import java.util.Scanner;
+
+import static java.util.Collections.swap;
+
+class Stats
+{
+  public static void main(String... args)
+  {
+    var scanner = new Scanner(System.in);
+    int n = scanner.nextInt();
+    var numbers = new ArrayList<Double>();
+    for (int i = 0; i < n; ++i)
+      numbers.add(scanner.nextDouble());
+    for (int m = 0; n > 1; n = m, m = 0)
+      for (int i = 1; i < n; ++i)
+        if (numbers.get(i).compareTo(numbers.get(i - 1)) < 0)
+          swap(numbers, m = i, i - 1);
+    System.out.println(numbers);
+  }
+}

usth/ICT2.2/labwork/4/Centroid.java

@@ -0,0 +1,26 @@
+import java.util.Scanner;
+
+class Centriod
+{
+  public static void main(String... args)
+  {
+    var scanner = new Scanner(System.in);
+    double m = 0.0, x = 0.0, y = 0.0;
+
+    while (scanner.hasNextDouble())
+      {
+        double n = scanner.nextDouble();
+        if (!scanner.hasNextDouble())
+          break;
+        double s = scanner.nextDouble();
+        if (!scanner.hasNextDouble())
+          break;
+        double i = scanner.nextDouble();
+
+        m += n;
+        x += n * s;
+        y += n * i;
+      }
+    System.out.println(m + " " + x/m + " " + y/m);
+  }
+}

usth/ICT2.2/labwork/4/Closest.java

@@ -0,0 +1,45 @@
+import java.util.Scanner;
+
+class Closest
+{
+  private static double x, y, z;
+
+  private static double dist(double a, double b, double c)
+  {
+    double g = x - a;
+    double h = y - b;
+    double i = z - c;
+    return g*g + h*h + i*i;
+  }
+
+  public static void main(String... args)
+  {
+    var scanner = new Scanner(System.in);
+    Double length = null;
+    double a = 0.0, b = 0.0, c = 0.0;
+
+    x = Double.parseDouble(args[0]);
+    y = Double.parseDouble(args[1]);
+    z = Double.parseDouble(args[2]);
+    while (scanner.hasNextDouble())
+      {
+        double d = scanner.nextDouble();
+        if (!scanner.hasNextDouble())
+          break;
+        double e = scanner.nextDouble();
+        if (!scanner.hasNextDouble())
+          break;
+        double f = scanner.nextDouble();
+        double len = dist(d, e, f);
+
+        if (length == null || len < length)
+          {
+            length = len;
+            a = d;
+            b = e;
+            c = f;
+          }
+      }
+    System.out.println(a + " " + b + " " + c);
+  }
+}

usth/ICT2.2/labwork/4/Deal.java

@@ -0,0 +1,27 @@
+import static java.util.Collections.shuffle;
+import static java.util.stream.Collectors.toList;
+import static java.util.stream.IntStream.range;
+
+class Deal
+{
+  static final String[] suits = {"clubs", "diamonds", "hearts", "spades"};
+  static final String[] ranks = {"Ace", "Two", "Three", "Four", "Five",
+                                 "Six", "Seven", "Eight", "Nine", "Ten",
+                                 "Jack", "Queen", "King"};
+
+  public static void main(String... args)
+  {
+    var deck = range(0, 52).boxed().collect(toList());
+    shuffle(deck);
+
+    // I have no time handling exceptions.
+    int n = Integer.parseInt(args[0]) % 52;
+    while (n-- > 0)
+      {
+        int card = deck.get(n);
+        int suit = card / 13;
+        int rank = card % 13;
+        System.out.printf("%s of %s\n", ranks[rank], suits[suit]);
+      }
+  }
+}

usth/ICT2.2/labwork/4/DiscreteDistro.java

@@ -0,0 +1,23 @@
+import java.util.concurrent.ThreadLocalRandom;
+import java.util.stream.Stream;
+
+import static java.util.Collections.binarySearch;
+import static java.util.stream.Collectors.toList;
+
+class DiscreteDistro
+{
+  public static void main(String... args)
+  {
+    var numbers = Stream.of(args).mapToInt(Integer::parseInt)
+                                 .boxed().collect(toList());
+    int n = numbers.size();
+    for (int i = 1; i < n; ++i)
+      numbers.set(i, numbers.get(i) + numbers.get(i - 1));
+
+    int x = ThreadLocalRandom.current().nextInt(0, numbers.get(n - 1));
+    int i = binarySearch(numbers, x) + 1;
+    System.out.println(numbers);
+    System.out.println(x);
+    System.out.println((i < 0) ? -i : i);
+  }
+}

usth/ICT2.2/labwork/4/Employ.java

@@ -0,0 +1,30 @@
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.util.ArrayList;
+import java.util.Scanner;
+
+class Employ
+{
+  private static Employee scan(Scanner s)
+  {
+    int ID = s.nextInt();
+    s.nextLine();
+    return new Employee(ID, s.nextLine(), s.nextLine(),
+                        s.nextDouble(), s.nextDouble());
+  }
+
+  public static void main(String... args) throws FileNotFoundException
+  {
+    var stdin = new Scanner(System.in);
+    var f = new File("employees.txt");
+    var file = new Scanner(f);
+    var employees = new ArrayList<Employee>();
+    int n = stdin.nextInt();
+    for (int i = 0; i < n; ++i)
+      {
+        employees.add(scan(stdin));
+        employees.add(scan(file));
+      }
+    employees.forEach(System.out::println);
+  }
+}

usth/ICT2.2/labwork/4/Employee.java

@@ -0,0 +1,27 @@
+public class Employee
+{
+  private int ID;
+  private String name;
+  private String dep;
+  private double basic;
+  private double extra;
+
+  public Employee(int ID, String name, String dep, double basic, double extra)
+  {
+    this.ID = ID;
+    this.name = name;
+    this.dep = dep;
+    this.basic = basic;
+    this.extra = extra;
+  }
+
+  public int getID() { return ID; }
+  public String getName() { return name; }
+  public String getDep() { return dep; }
+  public double getIncome() { return basic + extra*2.5; }
+
+  public String toString()
+  {
+    return String.format("#%d %s [%s]: %g", ID, name, dep, getIncome());
+  }
+}

usth/ICT2.2/labwork/4/HowMany.java

@@ -0,0 +1,7 @@
+class HowMany
+{
+  public static void main(String... args)
+  {
+    System.out.println(args.length);
+  }
+}

usth/ICT2.2/labwork/4/LongestRun.java

@@ -0,0 +1,30 @@
+import java.util.Scanner;
+
+class LongestRun
+{
+  public static void main(String... args)
+  {
+    var scanner = new Scanner(System.in);
+    Integer number = null;
+    Integer length = null;
+    Integer n = null, len = null;
+
+    while (scanner.hasNextInt())
+      {
+        Integer i = scanner.nextInt();
+        if (i == n)
+          {
+            len++;
+            continue;
+          }
+        if (length == null || len > length)
+          {
+            number = n;
+            length = len;
+          }
+        n = i;
+        len = 1;
+      }
+    System.out.printf("Longest run: %d consecutive %d\n", number, length);
+  }
+}

usth/ICT2.2/labwork/4/MaxMin.java

@@ -0,0 +1,18 @@
+import java.util.ArrayList;
+import java.util.Scanner;
+
+import static java.util.Collections.min;
+import static java.util.Collections.max;
+import static java.util.stream.Collectors.toList;
+
+class MaxMin
+{
+  public static void main(String... args)
+  {
+    var numbers = new ArrayList<Integer>();
+    var scanner = new Scanner(System.in);
+    while (scanner.hasNextInt())
+      numbers.add(scanner.nextInt());
+    System.out.printf("Min: %d\nMax: %d\n", min(numbers), max(numbers));
+  }
+}

usth/ICT2.2/labwork/4/Stats.java

@@ -0,0 +1,19 @@
+import java.util.ArrayList;
+import java.util.Scanner;
+
+class Stats
+{
+  public static void main(String... args)
+  {
+    var scanner = new Scanner(System.in);
+    int n = scanner.nextInt();
+    var numbers = new ArrayList<Double>();
+    for (int i = 0; i < n; ++i)
+      numbers.add(scanner.nextDouble());
+
+    double m = numbers.stream().mapToDouble(Double::doubleValue).sum() / n;
+    double s = Math.sqrt(numbers.stream()
+                         .mapToDouble(x -> Math.pow(x - m, 2)).sum() / n);
+    System.out.printf("Mean: %f\nStandard deviation: %f\n", m, s);
+  }
+}

usth/ICT2.2/labwork/4/Transpose.java

@@ -0,0 +1,24 @@
+class Transpose
+{
+  public static void main(String... args)
+  {
+    int[][] m = {{7, 8, 9},
+                 {4, 5, 6},
+                 {1, 2, 3}};
+    int n = 3;  // some sort of abstraction
+    System.out.println("Original matrix:");
+    for (int i = 0; i < n; ++i)
+      System.out.printf("%d %d %d\n", m[i][0], m[i][1], m[i][2]);
+
+    for (int i = 1; i < n; ++i)
+      for (int j = 0; j < i; ++j)
+        {
+          m[i][j] ^= m[j][i];
+          m[j][i] ^= m[i][j];
+          m[i][j] ^= m[j][i];
+        }
+    System.out.println("Transposed matrix:");
+    for (int i = 0; i < n; ++i)
+      System.out.printf("%d %d %d\n", m[i][0], m[i][1], m[i][2]);
+  }
+}

usth/ICT2.2/labwork/4/WordCount.java

@@ -0,0 +1,16 @@
+import java.util.Scanner;
+
+class WordCount
+{
+  public static void main(String... args)
+  {
+    var scanner = new Scanner(System.in);
+    int count = 0;
+    while (scanner.hasNext())
+      {
+        scanner.next();
+        count++;
+      }
+    System.out.println(count);
+  }
+}