Java Basic(83)-FlowLayout

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class Layout extends JFrame{

private JButton lb;

private JButton cb;

private JButton rb;

private FlowLayout layout;

private Container container;

public Layout(){

super("the title");

layout = new FlowLayout();

container = getContentPane();

setLayout(layout);

/ /左的東西在這裡

lb = new JButton("left");

add(lb);

lb.addActionListener(

new ActionListener(){

public void actionPerformed(ActionEvent event){

layout.setAlignment(FlowLayout.LEFT);

layout.layoutContainer(container);

}

}

);

/ /中心的東西在這裡

cb = new JButton("center");

add(cb);

cb.addActionListener(

new ActionListener(){

public void actionPerformed(ActionEvent event){

layout.setAlignment(FlowLayout.CENTER);

layout.layoutContainer(container);

}

}

);

//右的東西在這裡

rb = new JButton("right");

add(rb);

rb.addActionListener(

new ActionListener(){

public void actionPerformed(ActionEvent event){

layout.setAlignment(FlowLayout.RIGHT);

layout.layoutContainer(container);

}

}

);

}

}

import javax.swing.*;

public class bucky {

public static void main(String[] args){

Layout l = new Layout();

l.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

l.setSize(300,100);

l.setVisible(true);

}

}