Citazione:

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Messaggio inserito da Aiace

Ho creato due classi che estendono un JFrame e un JPanel, che chiamo rispettivamente, per semplificare, JMioFrame e JMioPanel.

All'interno di JMioFrame, dichiaro come variabile static un oggetto di tipo JMioPanel.

class JMioFrame extends JFrame {
      ...
      private static JMioPanel miopanel = new JMioPanel();
      ...
}

<snip>

A me sembra tutto corretto... eppure il pulsante "chiudi" viene visualizzato nel popup, ma il miopanel no !!!

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import javax.swing.*;
import java.awt.*;
 
public class MyPanel extends JPanel {
	static final long serialVersionUID =1;
	private JPanel header =new JPanel();
	private JPanel body=new JPanel();
	
	MyPanel (){
		//setBackground(Color.LIGHT_GRAY);
		//setBorder(BorderFactory.createEtchedBorder());
		setLayout(new BorderLayout());
		
		//populate header with your buttons & stuff...
		JLabel lab = new JLabel("Header region");
		header.add(lab);
		JButton b=new JButton("Button1");
		header.add(b);
		b=new JButton("Button 2");
		header.add(b);
		b=new JButton("Button 3");
		header.add(b);
		
		add(header,BorderLayout.NORTH);
		add(body,BorderLayout.CENTER);
	}
 
	// Deligate all required JPanel methods to body!!!
	// e.g.:
	public Component add(Component c){
		return body.add(c);
	}
}

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 
public class TestFrame extends JFrame {
	static final long serialVersionUID =1;
	
	public static void main(String[] args) {
		TestFrame frame= new TestFrame();
		MyPanel my= new MyPanel();
		frame.add(my);
		my.add(new JButton("BLABLABLUBB"));
		my.add(new JButton("BLABLABLUBB2"));
		my.add(new JButton("BLABLABLUBB3"));
		my.add(new JButton("BLABLABLUBB4"));
		
		frame.setVisible(true);
	}
	
	public TestFrame() {
        JMenuBar menuBar = new JMenuBar();
        JMenu menuFile = new JMenu();
        JMenuItem menuFileExit = new JMenuItem();
 
        menuFile.setText("file");
        menuFileExit.setText("exit");
 
        // Add action listener.for the menu button
        menuFileExit.addActionListener
        (
            new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                    TestFrame.this.windowClosed();
                }
            }
        );
        menuFile.add(menuFileExit);
        menuBar.add(menuFile);
 
        setTitle("TestFrame");
        setJMenuBar(menuBar);
        setSize(new Dimension(800, 500));
 
        // Add window listener.
        this.addWindowListener
        (
            new WindowAdapter() {
                public void windowClosing(WindowEvent e) {
                    TestFrame.this.windowClosed();
                }
            }
        );
    }
 
    protected void windowClosed() {
        System.exit(0);
    }
 
}