Swing计算按钮点击次数 代码

计算按钮点击次数

package swing;
import javax.swing.*; //引入Swing包名
  //import com.sun.java.swing.*;  
  //使用JDK 1.2 Beta 4版和所有Swing 1.1 Beta 3
  //之前的版本,引入Swing包名用此方法。
  import java.awt.*;
  import java.awt.event.*;
  public class SwingAppTest {
    private static String labelPrefix = "Number of button clicks: ";
    private int numClicks = 0; //计数器，计算点击次数
    public Component createComponents() {
      final JLabel label = new JLabel(labelPrefix + "0 ");
      JButton button = new JButton("I'm a Swing button!");
    button.setMnemonic(KeyEvent.VK_I); //设置按钮的热键为'I'
    button.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        numClicks++;
        label.setText(labelPrefix + numClicks);
                 //显示按钮被点击的次数
      }
//http://comic.duowan.com/viewchapter-cid-54-chapterid-1391-15.html
    });
    label.setLabelFor(button);
    /* 在顶层容器及其内容之间放置空间的常用办法是把内容添加到Jpanel上，而Jpanel本身没有边框的。*/
 
    JPanel pane = new JPanel();
    pane.setBorder(BorderFactory.createEmptyBorder(
              30, //top
              30, //left
              10, //bottom
              30) //right
              );
     pane.setLayout(new GridLayout(0, 1)); //单列多行
     pane.add(button);
     pane.add(label);
     return pane;
  }
  public static void main(String[] args) {
     try {
       UIManager.setLookAndFeel(
         UIManager.getCrossPlatformLookAndFeelClassName());
                          //设置窗口风格
     } catch (Exception e) { }
     //创建顶层容器并添加内容.
     JFrame frame = new JFrame("SwingApplication");
     SwingAppTest app = new SwingAppTest();
     Component contents = app.createComponents();
     frame.getContentPane().add(contents, BorderLayout.CENTER);
     //窗口设置结束，开始显示
     frame.addWindowListener(new WindowAdapter() {  
                      //匿名类用于注册监听器
       public void windowClosing(WindowEvent e) {
         System.exit(0);
       }
     });
     frame.pack();
     frame.setVisible(true);
   }
  }