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PO
 

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  1. PO
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    <p>What you want to do is <strong>drawing some random circles</strong> on the <code>drawPanel</code> when <strong>button clicked</strong>. I write you a <strong>simplified version</strong> to show how things work.</p> <p><img src="https://i.stack.imgur.com/qi2F6.jpg" alt="sample"></p> <p>I only keep the <code>drawButton</code> and <code>paintPanel</code> to keep things simple.</p> <pre><code>public class PaintFrame extends JFrame { private JPanel content = new JPanel(); private JButton drawButton = new JButton("Draw"); private PaintPanel paintPanel = new PaintPanel(); public PaintFrame() { getContentPane().add(content); content.setLayout(new BorderLayout()); drawButton.setSize(100, 500); drawButton.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { // drawButton is fired, repaint the paintPanel paintPanel.repaint(); } }); content.add(drawButton, BorderLayout.WEST); content.add(paintPanel, BorderLayout.CENTER); } } </code></pre> <p>You need a new class extending the JPanel and override the <code>paintComponent</code> method to do the paint job for you. This <strong>makes sure you are drawing on the panel</strong>. </p> <pre><code>class PaintPanel extends JPanel { public PaintPanel() { setSize(500, 500); setBackground(Color.BLACK); } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); Random random = new Random(); g.setColor(Color.WHITE); // draw 5 random circles int count = 5; for (int i = 0; i &lt; count; i++) { g.drawOval(random.nextInt(250), random.nextInt(250), random.nextInt(250), random.nextInt(250)); } } } </code></pre> <p>Main class</p> <pre><code>public class DrawMain { public static void main(String[] args) { JFrame frame = new PaintFrame(); frame.setDefaultCloseOperation(PaintFrame.EXIT_ON_CLOSE); frame.setSize(600, 500); frame.setVisible(true); } } </code></pre>
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    1. PORandom circles JAVA
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    1. USDrogba
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    1. COIm trying to use your example to add my other buttons so it has "Draw" "clear" and an textArea for the ammount of circles. When I add buttons, it makes them all the same size and doesnt format how I want
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      1. USChris
    2. CO`drawOval` parameters controls the size of the circle.
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      1. USDrogba
    3. CO@Chris Edit your post with updated codes so we can help.
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