Java GUI之ActionListener

最新推荐文章于 2021-05-30 23:32:04 发布

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最新推荐文章于 2021-05-30 23:32:04 发布

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分类专栏： JavaGUI 文章标签： java gui

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本文介绍了一个使用Java Swing创建GUI应用程序的示例，演示了如何为不同的按钮注册ActionListener以响应用户的点击事件。通过实例展示了如何改变窗口背景颜色、退出程序及显示提示消息。

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A listener interface for receiving ActionEvents. An implementation of this interface must be thread-safe.

A class that is interested in receiving such events implements this interface, and then registers itself with the source

UIComponent of interest, by calling addActionListener().

public class ActionListen extends JFrame {

   /**
    * 
    */
   private static final long serialVersionUID = 1L;
   JButton buttonOne = new JButton("按钮");
   JButton buttonTwo = new JButton("melody");
   JButton buttonThree = new JButton("soft");

   ActionListen() {
      setLayout(new FlowLayout());
      add(buttonOne);
      add(buttonTwo);
      add(buttonThree);
      buttonOne.addActionListener(new ActionListener() {

         @Override
         public void actionPerformed(ActionEvent arg0) {
            // TODO Auto-generated method stub
            Container container = getContentPane();
            if (arg0.getSource() == buttonOne) { // 获取当前组件的变量名
               container.setBackground(Color.blue);
            }
         }
      });
      buttonTwo.addActionListener(new ActionListener() {

         @Override
         public void actionPerformed(ActionEvent arg0) {
            // TODO Auto-generated method stub
            String str = arg0.getActionCommand(); // 获取监听事件源的名称字符串
            if (str == "melody") {
               System.exit(0);
            }
         }
      });
      buttonThree.addActionListener(new ActionListener() {

         @Override
         public void actionPerformed(ActionEvent arg0) {
            // TODO Auto-generated method stub
            if (arg0.getSource() == buttonThree) {
               JOptionPane.showMessageDialog(null,
                     "你点击的按钮是" + arg0.getActionCommand());
               // 面板信息框
            }
         }
      });
      setBounds(350, 100, 600, 500);
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      setVisible(true);
   }

   public static void main(String[] args) {
      new ActionListen();
   }
}