flowlayoutdemo.java

学习Java的一些基本课件和源代码 对于初学者很有帮助的

//FlowLayoutDemo.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class FlowLayoutDemo extends JFrame implements ActionListener{
	private JButton leftButton,centerButton,rightButton;
	private Container container;
	private FlowLayout layout;
	
	public FlowLayoutDemo()
	{
		super("流式布局示例");
		layout=new FlowLayout();
		
		container=getContentPane();
		container.setLayout(layout);
		leftButton=new JButton("左对齐");
		leftButton.addActionListener(this);
		container.add(leftButton);
		centerButton=new JButton("中间对齐");
		centerButton.addActionListener(this);
		container.add(centerButton);
		rightButton=new JButton("右对齐");
		rightButton.addActionListener(this);
		container.add(rightButton);
		setSize(300,75);
		setVisible(true);		
	}
	
	public void actionPerformed(ActionEvent e)
	{
		if(e.getSource()==leftButton)
		  layout.setAlignment(FlowLayout.LEFT);
		else if(e.getSource()==centerButton)
		      layout.setAlignment(FlowLayout.CENTER);
		      else layout.setAlignment(FlowLayout.RIGHT);
		layout.layoutContainer(container);
	}
	
	public static void main(String[] args)
	{
		FlowLayoutDemo application=new FlowLayoutDemo();
		application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
}