chore: include bunch of homeworks

src/main/java/me/alex4386/gachon/sw14462/Main.java

@@ -5,7 +5,7 @@
 import java.util.*;
 
 public class Main {
-    public static String currentTarget = "day06";
+    public static String currentTarget = "day08";
     public static boolean fallbackToLatest = true;
 
     public static Map<String, Class<?>> getAvailableTargetClassNames() {

src/main/java/me/alex4386/gachon/sw14462/day08/Main.java

@@ -0,0 +1,26 @@
+package me.alex4386.gachon.sw14462.day08;
+
+import java.lang.reflect.InvocationTargetException;
+
+public class Main {
+    public static String chainloadTarget = "ex4_7";
+
+    public static void main(String[] args) {
+        String packageName = Main.class.getPackage().getName();
+        String chainLoadTargetClass = packageName + "." + chainloadTarget + ".Main";
+
+        try {
+            Class<?> klass = Class.forName(chainLoadTargetClass);
+            klass.getMethod("main", String[].class).invoke(null, (Object) args);
+        } catch (ClassNotFoundException e) {
+            System.err.println("Failed to find the chainload target class.");
+            e.printStackTrace();
+        } catch (InvocationTargetException e) {
+            throw new RuntimeException(e);
+        } catch (IllegalAccessException e) {
+            throw new RuntimeException(e);
+        } catch (NoSuchMethodException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}

src/main/java/me/alex4386/gachon/sw14462/day08/ex4_1/Main.java

@@ -0,0 +1,9 @@
+package me.alex4386.gachon.sw14462.day08.ex4_1;
+
+//TIP To <b>Run</b> code, press <shortcut actionId="Run"/> or
+// click the <icon src="AllIcons.Actions.Execute"/> icon in the gutter.
+public class Main {
+    public static void main(String[] args) {
+        MotorBoatTest.main(args);
+    }
+}

src/main/java/me/alex4386/gachon/sw14462/day08/ex4_1/MotorBoat.java

@@ -0,0 +1,33 @@
+package me.alex4386.gachon.sw14462.day08.ex4_1;
+
+public class MotorBoat {
+    public double tankCapacity;
+    public double fuelInTank;
+    public double maximumSpeed;
+    public double currentSpeed = 0;
+    public double fuelEfficiency;
+
+    public void printFuelUsage(double t) {
+        System.out.println("Maximum speed fuel usage: "+this.getFuelUsage(t, this.maximumSpeed));
+        System.out.println("Current speed fuel usage: "+this.getFuelUsage(t));
+    }
+
+    public double getFuelUsage(double time) {
+        return this.getFuelUsage(time, this.currentSpeed);
+    }
+
+    public double getFuelUsage(double time, double speed) {
+        return this.fuelEfficiency * Math.pow(speed, 2) * time;
+    }
+
+    public double getTravelledDistance(double time) {
+        return this.currentSpeed * time;
+    }
+
+    public double getAvailableDistance() {
+        return this.fuelInTank / (this.fuelEfficiency * this.currentSpeed);
+    }
+
+
+
+}

src/main/java/me/alex4386/gachon/sw14462/day08/ex4_1/MotorBoatTest.java

@@ -0,0 +1,19 @@
+package me.alex4386.gachon.sw14462.day08.ex4_1;
+
+public class MotorBoatTest {
+    public static void main(String[] args) {
+        MotorBoat boat = new MotorBoat();
+
+        // provision boat instance - since I can not use constructor "yet"
+        boat.tankCapacity = 100;
+        boat.fuelInTank = 50;
+        boat.maximumSpeed = 100;
+        boat.currentSpeed = 50;
+        boat.fuelEfficiency = 0.1;
+
+        // test section
+        boat.printFuelUsage(10);
+        System.out.println("Travelled distance: "+boat.getTravelledDistance(10));
+        System.out.println("Available distance: "+boat.getAvailableDistance());
+    }
+}

src/main/java/me/alex4386/gachon/sw14462/day08/ex4_2a/Main.java

@@ -0,0 +1,7 @@
+package me.alex4386.gachon.sw14462.day08.ex4_2a;
+
+public class Main {
+    public static void main(String[] args) {
+        MotorBoatTest.main(args);
+    }
+}

src/main/java/me/alex4386/gachon/sw14462/day08/ex4_2a/MotorBoat.java

@@ -0,0 +1,72 @@
+package me.alex4386.gachon.sw14462.day08.ex4_2a;
+
+public class MotorBoat {
+    public static final double tankCapacity = 60.0;
+    private double fuelInTank;
+    private double maximumSpeed;
+    private double currentSpeed = 0;
+    private double fuelEfficiency;
+
+    // === GETTER & SETTER ===
+    public double getFuelInTank() {
+        return this.fuelInTank;
+    }
+
+    public void setFuelInTank(double fuelInTank) {
+        if (fuelInTank > tankCapacity) {
+            throw new IllegalArgumentException("Fuel in tank cannot exceed tank capacity");
+        }
+
+        this.fuelInTank = fuelInTank;
+    }
+
+    public double getMaximumSpeed() {
+        return this.maximumSpeed;
+    }
+
+    public void setMaximumSpeed(double maximumSpeed) {
+        this.maximumSpeed = maximumSpeed;
+    }
+
+    public double getCurrentSpeed() {
+        return this.currentSpeed;
+    }
+
+    public void setCurrentSpeed(double currentSpeed) {
+        this.currentSpeed = currentSpeed;
+    }
+
+    public double getFuelEfficiency() {
+        return this.fuelEfficiency;
+    }
+
+    public void setFuelEfficiency(double fuelEfficiency) {
+        this.fuelEfficiency = fuelEfficiency;
+    }
+
+
+
+    public void printFuelUsage(double t) {
+        System.out.println("Maximum speed fuel usage: "+this.getFuelUsage(t, this.maximumSpeed));
+        System.out.println("Current speed fuel usage: "+this.getFuelUsage(t));
+    }
+
+    public double getFuelUsage(double time) {
+        return this.getFuelUsage(time, this.currentSpeed);
+    }
+
+    public double getFuelUsage(double time, double speed) {
+        return this.fuelEfficiency * Math.pow(speed, 2) * time;
+    }
+
+    public double getTravelledDistance(double time) {
+        return this.currentSpeed * time;
+    }
+
+    public double getAvailableDistance() {
+        return this.fuelInTank / (this.fuelEfficiency * this.currentSpeed);
+    }
+
+
+
+}

src/main/java/me/alex4386/gachon/sw14462/day08/ex4_2a/MotorBoatTest.java

@@ -0,0 +1,16 @@
+package me.alex4386.gachon.sw14462.day08.ex4_2a;
+
+public class MotorBoatTest {
+    public static void main(String[] args) {
+        MotorBoat boat = new MotorBoat();
+        boat.setFuelInTank(50);
+        boat.setCurrentSpeed(50);
+        boat.setFuelEfficiency(0.1);
+
+        boat.printFuelUsage(5);
+        System.out.println("Maximum speed fuel usage: "+boat.getFuelUsage(10, boat.getMaximumSpeed()));
+        System.out.println("Current speed fuel usage: "+boat.getFuelUsage(10));
+        System.out.println("Travelled distance: "+boat.getTravelledDistance(10));
+        System.out.println("Available distance: "+boat.getAvailableDistance());
+    }
+}

src/main/java/me/alex4386/gachon/sw14462/day08/ex4_2b/Counter.java

@@ -0,0 +1,26 @@
+package me.alex4386.gachon.sw14462.day08.ex4_2b;
+
+public class Counter {
+    private int count = 0;
+
+    public void resetCounter() {
+        this.count = 0;
+    }
+
+    public void increase() {
+        count++;
+    }
+
+    public void decrease() {
+        if (count <= 0) {
+            throw new RuntimeException("Count cannot be negative");
+        }
+        count--;
+    }
+
+    public int getCount() {
+        return count;
+    }
+
+
+}

src/main/java/me/alex4386/gachon/sw14462/day08/ex4_2b/CounterTest.java

@@ -0,0 +1,25 @@
+package me.alex4386.gachon.sw14462.day08.ex4_2b;
+
+public class CounterTest {
+    public static void main(String[] args) {
+        Counter counter = new Counter();
+
+        System.out.println("Increasing twice");
+        counter.increase();
+        counter.increase();
+
+        assert counter.getCount() == 2;
+
+        System.out.println("Decreasing once");
+        counter.decrease();
+
+        assert counter.getCount() == 1;
+
+        System.out.println("Resetting counter");
+        counter.resetCounter();
+
+        assert counter.getCount() == 0;
+
+        System.out.println("Test complete.");
+    }
+}

src/main/java/me/alex4386/gachon/sw14462/day08/ex4_2b/Main.java

@@ -0,0 +1,7 @@
+package me.alex4386.gachon.sw14462.day08.ex4_2b;
+
+public class Main {
+    public static void main(String[] args) {
+        CounterTest.main(args);
+    }
+}

src/main/java/me/alex4386/gachon/sw14462/day08/ex4_3/GradeDistribution.java

@@ -0,0 +1,72 @@
+package me.alex4386.gachon.sw14462.day08.ex4_3;
+
+public class GradeDistribution {
+    final char grades[] = {'A', 'B', 'C', 'D', 'F'};
+    int[] gradeNums = new int[5];
+
+    public void setGradeNums(char letter, int num) {
+        switch (letter) {
+            case 'A':
+                gradeNums[0] = num;
+                break;
+            case 'B':
+                gradeNums[1] = num;
+                break;
+            case 'C':
+                gradeNums[2] = num;
+                break;
+            case 'D':
+                gradeNums[3] = num;
+                break;
+            case 'F':
+                gradeNums[4] = num;
+                break;
+        }
+    }
+
+    public int getGradeNums(char letter) {
+        switch (letter) {
+            case 'A':
+                return gradeNums[0];
+            case 'B':
+                return gradeNums[1];
+            case 'C':
+                return gradeNums[2];
+            case 'D':
+                return gradeNums[3];
+            case 'F':
+                return gradeNums[4];
+            default:
+                return 0;
+        }
+    }
+
+    public int totalGradeNums() {
+        int total = 0;
+        for (int i = 0; i < gradeNums.length; i++) {
+            total += gradeNums[i];
+        }
+        return total;
+    }
+
+    public double gradePercentage(char letter) {
+        return ((double) getGradeNums(letter) / totalGradeNums()) * 100.0;
+    }
+
+    public void drawBarGraph() {
+        int columns = 50;
+        for (int i = 0; i < columns; i++) {
+            System.out.print("*");
+        }
+        System.out.println();
+
+        for (int i = 0; i < gradeNums.length; i++) {
+            double multiplier = (double) columns / 100.0;
+            int counts = (int) Math.round(this.gradePercentage(grades[i]) * multiplier);
+            for (int j = 0; j < counts; j++) {
+                System.out.print("*");
+            }
+            System.out.println();
+        }
+    }
+}

src/main/java/me/alex4386/gachon/sw14462/day08/ex4_3/Main.java

@@ -0,0 +1,22 @@
+package me.alex4386.gachon.sw14462.day08.ex4_3;
+
+public class Main {
+    public static void main(String[] args) {
+        GradeDistribution gradeDistribution = new GradeDistribution();
+
+        gradeDistribution.setGradeNums('A', 1);
+        gradeDistribution.setGradeNums('B', 4);
+        gradeDistribution.setGradeNums('C', 6);
+        gradeDistribution.setGradeNums('D', 2);
+        gradeDistribution.setGradeNums('F', 1);
+
+        System.out.println("Grade Distribution");
+        System.out.println("A: " + gradeDistribution.getGradeNums('A') + " (" + gradeDistribution.gradePercentage('A') + "%)");
+        System.out.println("B: " + gradeDistribution.getGradeNums('B') + " (" + gradeDistribution.gradePercentage('B') + "%)");
+        System.out.println("C: " + gradeDistribution.getGradeNums('C') + " (" + gradeDistribution.gradePercentage('C') + "%)");
+        System.out.println("D: " + gradeDistribution.getGradeNums('D') + " (" + gradeDistribution.gradePercentage('D') + "%)");
+        System.out.println("F: " + gradeDistribution.getGradeNums('F') + " (" + gradeDistribution.gradePercentage('F') + "%)");
+
+        gradeDistribution.drawBarGraph();
+    }
+}

src/main/java/me/alex4386/gachon/sw14462/day08/ex4_4/Main.java

@@ -0,0 +1,9 @@
+package me.alex4386.gachon.sw14462.day08.ex4_4;
+
+import java.util.Scanner;
+
+public class Main {
+    public static void main(String[] args) {
+        PurchaseDemo.main(args);
+    }
+}