Java用户界面之按钮

可以添加到容器中的一种简单组件是JButton对象，JButton对象是一个可单击的按钮

　　创建JButton组件：JButton button = new JButton("Button");

　　调用add()方法将其加入容器中：add(button);

在容器中添加组件时，不需要指明组件在容器中的位置，组件的布局由布局管理器决定，最简单的布局管理器是FLowLayout类

　　创建FlowLayout对象：FlowLayout flo = new FlowLayout();

　　调用setLayout()方法将容器与管理器关联：setLayout(flo);

Demo：

 1 package com.swingdemo.demo;
 2
 3 import java.awt.FlowLayout;
 4
 5 import javax.swing.JButton;
 6 import javax.swing.JFrame;
 7 import javax.swing.UIManager;
 8 import javax.swing.UnsupportedLookAndFeelException;
 9
10 public class Playback extends JFrame {
11
12     private static final long serialVersionUID = 1L;
13
14     public Playback() {
15
16         super("Playback");
17         setLookAndFeel();
18         setSize(225, 80);
19         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
20         FlowLayout flo = new FlowLayout();
21         setLayout(flo);
22         JButton play = new JButton("Play");
23         JButton stop = new JButton("Stop");
24         JButton pause = new JButton("Pause");
25         add(play);
26         add(stop);
27         add(pause);
28         setVisible(true);
29
30     }
31
32     private void setLookAndFeel() {
33
34         try {
35             UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
36         } catch (Exception e) {
37             e.printStackTrace();
38         }
39     }
40
41     public static void main(String[] args) {
42
43         Playback pb = new Playback();
44
45     }
46
47 }