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Question

JLabel.setBounds()方法，前提是该窗体的layout manager为null

Answer 1

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class MF extends JFrame
{
public MF()
{
this.getContentPane().setLayout(new GridBagLayout());
GridBagConstraints gbc=new GridBagConstraints();
gbc.gridx=0;
gbc.gridy=0;
gbc.anchor=gbc.WEST;
this.getContentPane().add(new JLabel("label1"),gbc);
gbc.gridy++;
this.getContentPane().add(new JLabel("label2"),gbc);
gbc.gridy++;
gbc.gridx++;
gbc.weightx=100;
gbc.weighty=100;
gbc.fill=gbc.BOTH;
this.getContentPane().add(new JLabel(),gbc);
this.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
}
public static void main(String args[])
{
MF mf=new MF();
mf.setSize(600,600);
mf.setVisible(true); }
}