nulltest.java

java中五个布局管理例子

import java.awt.*;
import java.awt.event.*;

class NullTest extends Frame
{
	Button btn1,btn2,btn3,btn4;
	NullTest()
	{
		super("Null布局");
		setVisible(true);
		setSize(300,265);
		setLocation(450,300);
		setBackground(Color.yellow);
		Panel p=new Panel();
		p.setBackground(Color.blue);
		btn1=new Button("按钮1");
		btn2=new Button("按钮2");
		btn3=new Button("按钮3");
		btn4=new Button("按钮4");
		setLayout(null);
		add(p);
		add(btn1);
		add(btn2);
		add(btn3);
		add(btn4);
		p.setBounds(20,40,200,200);
		btn1.setBounds(230,60,50,30);
		btn2.setBounds(230,100,50,30);
		btn3.setBounds(230,140,50,30);
		btn4.setBounds(230,180,50,30);
		addWindowListener(new WindowAdapter()
		{
			public void windowClosing(WindowEvent e)
			{
				setVisible(false);
				System.exit(0);
			}
		});
	}

	public static void main(String[] args) 
	{
		NullTest t=new NullTest();
	}
}