窗口监听

窗口监听

• public class Demo07 {
      public static void main(String[] args) {
          new WindowFrame();
      }
  }
  
  class WindowFrame extends Frame{
      public WindowFrame() throws HeadlessException {
          setBackground(Color.CYAN);
          setBounds(100,100,300,300);
          setVisible(true);
          /*addWindowListener(new MyWindowListener() {
          });*/
  
          //匿名内部类（推荐）
          this.addWindowListener(new WindowAdapter() {
              @Override
              public void windowClosing(WindowEvent e) {
                  System.out.println("关闭");
              }
              @Override
              public void windowActivated(WindowEvent e) {
                  WindowFrame windowFrame = (WindowFrame) e.getSource();
                  windowFrame.setTitle("已激活");
                  System.out.println("激活");
              }
          });
      }
  
      /*class MyWindowListener extends WindowAdapter {
          @Override
          public void windowClosing(WindowEvent e) {
              setVisible(false);    //隐藏窗口，通过按钮隐藏
              System.exit(0);   //正常退出
          }
      }*/
  }