使用FlowLayout布局

package _4;

import java.awt.FlowLayout;

import javax.swing.JButton;

import javax.swing.JFrame;

public class FlowLayoutDemo extends JFrame {

private JButton button1 = new JButton("First Button");

private JButton button2 = new JButton("Second Button");

private JButton button3 = new JButton("Third Button");

private JButton button4 = new JButton("Fourth Button");

public FlowLayoutDemo() {

setSize(300, 150);

setLocation(400, 400);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

//设置布局方式为 FlowLayout

setLayout(new FlowLayout());

//添加按键,注意设置布局方式后任何对组件进行设置的方法都会失效

add(button1);

add(button2);

add(button3);

add(button4);

}

public static void main(String arg[]) {

FlowLayoutDemo frame = new FlowLayoutDemo();

frame.setVisible(true);

}

}