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    <p>Thank you for all you useful answers guys, I solved this problem as following : </p> <blockquote> <p>CreateShapes.java</p> </blockquote> <pre><code>import java.awt.Color; import java.awt.Graphics; public class CreateShapes { private Graphics g; private Color myColor; private int x1, x2, x3, x4; public CreateShapes(int x1, int x2, int x3, int x4, Color myColor){ this.x1 = x1; this.x2 = x2; this.x3 = x3; this.x4 = x4; this.myColor = myColor; } public void draw(Graphics g){ g.setColor(myColor); g.drawLine(x1, x2, x3, x4); } } </code></pre> <blockquote> <p>DrawShapes.java</p> </blockquote> <pre><code>import java.awt.Color; import java.awt.Graphics; import java.util.Random; import javax.swing.JPanel; public class DrawShapes extends JPanel{ private Random randomNumber = new Random(); private CreateShapes[] shapes; private int shapeCounter; public DrawShapes(){ setBackground(Color.WHITE); shapes = new CreateShapes[1+randomNumber.nextInt(15)]; for(int i = 0 ; i &lt; shapes.length ; i++){ int x1 = randomNumber.nextInt(600); int x2 = randomNumber.nextInt(600); int x3 = randomNumber.nextInt(600); int x4 = randomNumber.nextInt(600); Color color = new Color(randomNumber.nextInt(255), randomNumber.nextInt(255), randomNumber.nextInt(255), randomNumber.nextInt(255)); shapes[i] = new CreateShapes(x1, x2, x3, x4, color); } shapeCounter = shapes.length; } public int getShapesNumber(){ return shapeCounter; } @Override protected void paintComponent(Graphics g){ super.paintComponent(g); for(CreateShapes shape : shapes){ shape.draw(g); } } } </code></pre> <blockquote> <p>RandomShapesTest.java</p> </blockquote> <pre><code>import java.awt.BorderLayout; import javax.swing.JLabel; import javax.swing.JFrame; public class RandomShapesTest { public static void main(String[] args){ DrawShapes drawShapes = new DrawShapes(); JFrame application = new JFrame(); String status = String.format("Lines : %d", drawShapes.getShapesNumber()); JLabel statusBar = new JLabel(status); application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); application.add(drawShapes); application.add(statusBar,BorderLayout.SOUTH); application.setSize(600,600); application.setVisible(true); } } </code></pre> <p>Regards,,,</p>
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