Add second year

second/semester2/CT255/Assignments/Assigment-02/GameObject.java

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+import java.awt.*;
+import javax.swing.*;
+import java.util.*;
+
+public class GameObject {
+    // member data
+    private int x, y; 
+    private int height = 50, width = 50;
+    private Color c;
+    private int stepSize = 10;  // how many pixels the object will move at a time
+
+    // constructor 
+    public GameObject() {
+        // randomly generating colour
+        c = new Color((int)(Math.random()*255), (int)(Math.random()*255), (int)(Math.random()*255));
+
+        // randomly generating initial x y co-ordinates
+        x = (int)(Math.random()*600);
+        y = (int)(Math.random()*600);
+    }
+
+    // public interface 
+    public void move() {
+        // generating either a 1 or a 0 to determine if the square should move left or right and up or down - 1 = left/up, 0 = right/down
+        int xDirection = (int)(Math.random()*2);
+        int yDirection = (int)(Math.random()*2);
+
+        // changing the x & y co-ordinates by either plus or minus the stepSize, depending on the direction
+        x += (xDirection == 1) ? -stepSize : + stepSize; 
+        y += (yDirection == 1) ? -stepSize : + stepSize; 
+    } 
+
+    public void paint(Graphics g) {
+        // setting colour
+        g.setColor(c);
+
+        // make a filled rectangle with the specified dimensions at the specified x, y co-ordinates
+        g.fillRect(x, y, height, width);
+    }
+}
+

second/semester2/CT255/Assignments/Assigment-02/MovingSquaresApplication.java

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+import java.awt.*;
+import javax.swing.*;
+import java.util.*;
+
+public class MovingSquaresApplication extends JFrame implements Runnable {
+    // window dimensions
+    private static final Dimension WindowSize = new Dimension(600,600);
+
+    // array of gameobjects (squares)
+    private GameObject gameobjects[] = new GameObject[100]; 
+
+    // constructor
+    public MovingSquaresApplication() {
+        // create & set up the window 
+        this.setTitle("Moving Squares Apllication");
+        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+
+        // display the window. centred on the screen
+        Dimension screensize = java.awt.Toolkit.getDefaultToolkit().getScreenSize();
+        int x = screensize.width/2  - WindowSize.width/2;
+        int y = screensize.height/2 - WindowSize.height/2;
+        setBounds(x, y, WindowSize.width, WindowSize.height);
+        setVisible(true);
+
+        // create array of game objects. 
+        //Arrays.fill(gameobjects, 100);
+        for (int i = 0; i < 100; i++) {
+            gameobjects[i] = new GameObject();
+        }
+
+        // creating a new thread & starting it
+        Thread t = new Thread(this); 
+        t.start();
+    }
+
+    // run method called by thread
+    public void run() {
+        while (true) {
+            // iterating over array of gameobjects & calling move() on each object 
+            for (GameObject go : gameobjects) {
+                go.move();
+            }
+
+            try {
+                // sleeping
+                Thread.sleep(100);
+
+            // catching exception
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            }
+
+        // repainting now that every object has been moved
+        this.repaint();
+        }
+
+    }
+
+    // paint method
+    public void paint(Graphics g) {
+        // filling the screen with a white square between "frames" of animation to get rid of trails caused by moving objects
+        Color c = new Color(255, 255, 255);
+        g.setColor(c);
+        g.fillRect(0, 0, 1000, 1000);
+
+        // iterating over each GameObject and calling paint on it 
+        for (GameObject go : gameobjects) {
+            go.paint(g);
+        }
+    }
+
+    public static void main(String[] args) {
+        // instantiating class in main method to begin application
+        MovingSquaresApplication w = new MovingSquaresApplication();
+    }
+}