e1201.java

java小程序

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class E1201 extends JFrame implements ActionListener
{
private FlowLayout flowLayout;
private String name[]={"左","中","右"};
private JButton[] button=new JButton[name.length];
private Container c,c1;
private int align[]={FlowLayout.LEFT,FlowLayout.CENTER,FlowLayout.RIGHT};
private int j=0;

public E1201()
{
super("E1201.java:选择对集方式");
c=getContentPane();
c.setLayout(new FlowLayout(align[j]));
for(int i=0;i<name.length;i++)
{
button[i]=new JButton(name[i]);
c.add(button[i]);
button[i].addActionListener(this);
}
setSize(300,200);
setVisible(true);
}

public void actionPerformed(ActionEvent e)
{
String command=e.getActionCommand();
if(command.equals("左"))
{
j=0;
c.setLayout(new FlowLayout(align[j]));
setSize(300,200);
setVisible(true);
}
else if(command.equals("中"))
{
j=1;
c.setLayout(new FlowLayout(align[j]));
setSize(300,200);
setVisible(true);
}
else if(command.equals("右"))
{
j=2;
c.setLayout(new FlowLayout(align[j]));
setSize(300,200);
setVisible(true);
}
}

public static void main(String args[])
{
E1201 app=new E1201();
app.addWindowListener(new MyWindowListener());
}
}