java事件例子
import  t。*;
import  t。event。*;
import javax。swing。*;
public class EventDemo5 extends WindowAdapter implements ActionListener
{
    JButton b1 = null;
    JButton b2 = null;
    
    public EventDemo5()
    {
        JFrame f = new JFrame("EventDemo5");
        Container contentPane =  tContentPane();
         tLayout(new GridLayout(1,2));
        b1 = new JButton("按我有声音喔");
        b2 = new JButton("按我可开新窗口");
         dActionListener(this);
         dActionListener(this);
         d(b1);
         d(b2);
         ck();
         ow();
         dWindowListener(this);
    }
    public void actionPerformed(ActionEvent e)
    {
        if( tSource()==b1)//getSource判断哪个按钮被按下了。
  
             tDefaultToolkit()。beep();
        if( tSource()==b2)
        {
            JFrame newF = new JFrame("新窗口");
             tSize(200,200);
             ow();
        } 
    }
    
    public void windowClosing(WindowEvent e)
    {
        System。
  exit(0);
    }
    
    public static void main(String args[])
    {
        new EventDemo5();
    }
}
自定义异常处理例子：
class MyException extends Exception {
  private int detail;
  MyException(int a) {
    detail = a;
  }
  public String toString() {
    return "MyException[" + detail + "]";
  }
}
class ExceptionDemo {
  static void compute(int a) throws MyException {
     intln("Called compute(" + a + ")");
    if(a > 10)
      throw new MyException(a);
     intln("Normal exit");
  }
  public static void main(String args[]) {
    try {
      compute(1);
      compute(20);
    } catch (MyException e) {
       intln("Caught " + e);
    }
  }
}
。