Resizing JButton on JPanel?

Question

Hi all,
I just started to learn to use swing and I ran into problem when I try to change the size of a JButton on JPanel. The following code make sense to me, but it just doesn't work. Am I missing something? Can anyone give me some directions?
import javax.swing.*;
public class TestFrame extends JFrame
     public static void main(String[] args)
          TestFrame myFrame = new TestFrame();
          myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          myFrame.setVisible(true);
     private JPanel myPanel = new JPanel();
     private JButton myBtn = new JButton("Test");
     public TestFrame()
          setSize(300, 300);
          myBtn.setSize(200, 200); // the button size still does not change
          myPanel.add(myBtn);     
          getContentPane().add(myPanel);          
}

Answer 1

use setPreferredSize instead of setSize
import javax.swing.*;
import java.awt.Dimension;
public class TestFrame extends JFrame
     public static void main(String[] args)
          TestFrame myFrame = new TestFrame();
          myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          myFrame.setVisible(true);
     private JPanel myPanel = new JPanel();
     private JButton myBtn = new JButton("Test");
     public TestFrame()
          setSize(300, 300);
          //myBtn.setSize(200, 200); // the button size still does not change
          myBtn.setPreferredSize(new Dimension(200, 200));
          myPanel.add(myBtn);     
          getContentPane().add(myPanel);          
}