清华大学：JAVA教学课件：7-12

import java.awt.*;
import javax.swing.*;
public class NullLayoutDemo {
private JFrame frame;
private JButton b1,b2,b3;
public static void main(String args[]) {
NullLayoutDemo that = new NullLayoutDemo();
that.go();
}
void go() {
frame = new JFrame("Null Layout example");
Container contentPane = frame.getContentPane();
//设置布局管理器为null
contentPane.setLayout(null);
//添加按钮
b1 = new JButton("Yes");
contentPane.add(b1);
b2 = new JButton("No");
contentPane.add(b2);
b3 = new JButton("Cancel");
contentPane.add(b3);

//设置按钮的位置和大小
b1.setBounds(30,15,75,20);
b2.setBounds(60,60,75,50);
b3.setBounds(160,20,75,30);

frame.setSize(300,200 );
frame.setVisible(true);
}
}