Adding a JPanel into JFrame

Question

I have a class BoardGUI that extends JFrame. I have added buttons in a JPanel. When I try to add the panel into the frame with a mouselistoner on the frame, the buttons (undo and replay) become invisible. When I mouse over the buttons, they become visible.

Here is my code:

public class BoardGUI extends JFrame {
    JButton a=new JButton("Undo");
    JButton r=new JButton("replay");
    JPanel jp=new JPanel();

    public BoardGUI() {

        // TODO Auto-generated constructor stub
        setTitle("Checkers Game");
        setSize(645, 700);

        jp.setLayout(new FlowLayout());
        jp.setPreferredSize(new Dimension(645,35));
        a.setVisible(true);
        r.setVisible(true);
        jp.add(a);
        jp.add(r);
        add(jp,BorderLayout.SOUTH);
        setVisible(true);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        addMouseListener(new MouseListener() {

            @Override
            public void mouseReleased(MouseEvent arg0) {
                // TODO Auto-generated method stub

            }

            @Override
            public void mousePressed(MouseEvent arg0) {
                // TODO Auto-generated method stub

            }

            @Override
            public void mouseExited(MouseEvent arg0) {
                // TODO Auto-generated method stub

            }

            @Override
            public void mouseEntered(MouseEvent arg0) {
                // TODO Auto-generated method stub

            }

            @Override
            public void mouseClicked(MouseEvent arg0) {
                // TODO Auto-generated method stub
                repaint();

            }
        });


    }
    public void paint(Graphics g)
    {
        for(int i=0;i<8;i++)
        {
            for(int j=0;j<8;j++)
            {
                g.fillRect(i*100, j*100, 100, 100);
            }
        }
    }
}

Can anybody help me to fix this please?

possible duplicate of [How to set a JPanel over a JFrame?](http://stackoverflow.com/questions/21112572/how-to-set-a-jpanel-over-a-jframe) — Andrew Thompson, Jan 14 '14 at 13:06
Don't repost questions. Instead edit the firs one you asked! — Andrew Thompson, Jan 14 '14 at 13:07
i am a very new user to computer. i did not know. I will try to edit it next time. thank you — , Jan 14 '14 at 13:11

score 4 · Accepted Answer · answered Jan 14 '14 at 12:55

override getPreferredSize for JPanel, then to call JFrame.pack() instead of any sizing
don't to set PreferredSize
don't to override paint for JFrame, override paintComponent for (another, separate) JPanel, put this JPanel to the JFrames CENTER area

.

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.FlowLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class BoardGUI extends JFrame {

   private JButton a = new JButton("Undo");
   private  JButton r = new JButton("replay");
   private  JPanel jp = new JPanel();

    public BoardGUI() {
        setTitle("Checkers Game");
        jp.setLayout(new FlowLayout());
        jp = new JPanel() {
            @Override
            public Dimension getPreferredSize() {
                return new Dimension(new Dimension(645, 35));
            }

           /* @Override
            protected void paintComponent(Graphics g) {
                super.paintComponent(g);
                //
            }*/
        };
        jp.add(a);
        jp.add(r);
        add(jp, BorderLayout.SOUTH);
        pack();
        setVisible(true);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
    }

    public static void main(String args[]) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new BoardGUI();
            }
        });
    }
}

it piece of code is working. but as i said i am very beginner to java programming, can u please upload any even simple code of it so that i can understand it more thoroughly? — , Jan 14 '14 at 13:15
please to read [Oracle tutorial Performing Custom Painting](http://docs.oracle.com/javase/tutorial/uiswing/painting/index.html), rest of you can see in [posts by (leader here) @MadProgrammer](http://stackoverflow.com/search?tab=newest&q=user%3a992484%20paintcomponent) — mKorbel, Jan 14 '14 at 13:16

score 0 · Answer 2 · answered Jan 14 '14 at 12:53

0

You've got a 645 x 700 JFrame onto which you paint an 800 x 800 checkerboard. It's probably overwriting the buttons.

Put the checkerboard in its own JPanel, and draw within that panel only. Put that panel in the center of the JFrame.

answered Jan 14 '14 at 12:53

arcy

12,845
12
58
103

how can i paint in a Jpanel when my class is extended with JFrame? – Jan 14 '14 at 13:02

score 0 · Answer 3 · answered Jan 14 '14 at 12:54

0

Do not use:

a.setVisible(true);
r.setVisible(true);

NO need to use this. When you make frame visible using setVisible(true), all components will get painted.

answered Jan 14 '14 at 12:54

Rahul

3,479
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28

Adding a JPanel into JFrame

3 Answers3