java時鐘，java時鐘程式

java時鐘，java時鐘程式
 一般實現形式

 1 package ares.present; 2  3 import java.awt.event.ActionEvent; 4 import java.awt.event.ActionListener; 5 import java.util.Date; 6  7 public class Printer implements ActionListener { 8  9     @Override10     public void actionPerformed(ActionEvent e) {11         Date date=new Date();12         System.out.println(date);13     }14 }

 1 package ares.present; 2  3 import java.awt.event.ActionListener; 4 import javax.swing.JOptionPane; 5 import javax.swing.Timer; 6  7 public class Main { 8  9     public static void main(String[] args) {10        ActionListener listener= new Printer();11        Timer timer=new Timer(1000,listener);12        timer.start();13        JOptionPane.showMessageDialog(null, "Quit");14        System.exit(0);15     }16 }

升級版（匿名內部類）

 1 package ares.present; 2  3 import java.awt.event.ActionEvent; 4 import java.awt.event.ActionListener; 5 import java.util.Date; 6 import javax.swing.JOptionPane; 7 import javax.swing.Timer; 8  9 public class Main {10 11     public static void main(String[] args) {12         ActionListener listener=new ActionListener() {13             14             @Override15             public void actionPerformed(ActionEvent e) {16                Date date=new Date();17                System.out.println(date);18             }19         };20         21         Timer timer=new Timer(1000,listener);22         timer.start();23         JOptionPane.showMessageDialog(null, "Quit");24         System.exit(0);25     }26 }