e1202.java

java小程序

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class E1202 extends JFrame implements ActionListener
{
private String name[]={"北","东","南","西","中"};
private JButton button[]=new JButton[name.length];
private Container c;
public E1202()
{
super("E1202.java:设置五个方向版面");
for(int i=0;i<name.length;i++)
{
button[i]=new JButton(name[i]);
button[i].addActionListener(this);
}
c=getContentPane();
c.setLayout(new BorderLayout(5,5));
c.add(button[0],BorderLayout.NORTH);
c.add(button[1],BorderLayout.EAST);
c.add(button[2],BorderLayout.SOUTH);
c.add(button[3],BorderLayout.WEST);
c.add(button[4],BorderLayout.CENTER);
setSize(300,200);
setVisible(true);
}

public void actionPerformed(ActionEvent e)
{
String command=e.getActionCommand();
if(command.equals("北"))
{
remove(button[0]); 
doLayout();//设置为最优尺寸来调整其大小   
repaint();
setSize(300,200);
setVisible(true);
}
else if(command.equals("东"))
{
 remove(button[1]);   
doLayout(); 
repaint();
setSize(300,200);
setVisible(true);
}
else if(command.equals("南"))
{
 remove(button[2]); 
doLayout(); 
repaint(); 
setSize(300,200);
setVisible(true);
}
else if(command.equals("西"))
{
 remove(button[3]); 
doLayout(); 
repaint(); 
setSize(300,200);
setVisible(true);
}
else if(command.equals("中"))
{
remove(button[4]);  
doLayout(); 
repaint();
setSize(300,200);
setVisible(true);
}
}

public static void main(String args[])
{
E1202 app=new E1202();
app.addWindowListener(new MyWindowListener());
}
}