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POPassing Argument from JPanel into JFrame
 

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  1. POPassing Argument from JPanel into JFrame
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    <p>I had a problem which I didn't figure out how to solve it. I'm reading now (JAVA how to program 9th edition). My application (Chapter 9, page 390) needs to create a random number of different shapes with different colors, then layout (JFrame) contains a JPanel - which has shapes - and a JLabel - which has numbers of these different shapes. I created the random shapes with random colors, but the number of shapes cannot be passed correctly to main method. It always show me 0.</p> <blockquote> <p>RandomShapes.java</p> </blockquote> <pre><code>import java.awt.Color; import java.awt.Graphics; import java.util.Random; import javax.swing.JPanel; public class RandomShapes extends JPanel{ public int counter; private Random random = new Random(); @Override public void paintComponent(Graphics g){ super.paintComponent(g); drawLines(g); } public void drawLines(Graphics g){ for(int i = 0 ; i &lt; random.nextInt(20) ; i++){ g.setColor(generateColor()); g.drawLine(random.nextInt(getWidth()), random.nextInt(getHeight()), random.nextInt(getWidth()), random.nextInt(getHeight())); counter++; } } private Color generateColor(){ Color color = new Color(random.nextInt(255), random.nextInt(255), random.nextInt(255)); return color; } @Override public String toString(){ return String.format("%d",counter); } } </code></pre> <blockquote> <p>RandomShapesTest.java</p> </blockquote> <pre><code>import java.awt.BorderLayout; import javax.swing.JFrame; import javax.swing.JLabel; public class RandomShapesTest{ public static void main(String[] args){ RandomShapes shapes = new RandomShapes(); JFrame application = new JFrame(); JLabel status = new JLabel(shapes.toString()); application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); application.add(shapes); application.setSize(600,600); application.add(status, BorderLayout.NORTH); application.setVisible(true); } } </code></pre> <p>By the way, a little trick may be more helpful than full answer :)</p> <p>Regards,,,</p>
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    1. CODo you mean "counter" is always 0 ? I am sorry I don't understand your question. What do you mean by "cannot be passed correctly to main method". But counter seems not to be created at the right place.
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    2. CO,Consider creating your count in the class constructor and not in its paint components method.
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    3. COcounter variable counts the number of random shapes (lines in my example) has been created, then I want to view this number in JLabel.
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