JAVA秒表

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class StopWatch extends JFrame {
boolean secStart = false; //秒表线程启动控制
JFrame jf = new JFrame("Stop Watch");
JTextField jtf = new JTextField();
TextArea jta = new TextArea();
JButton jb4 = new JButton("DELETE");
JButton jb1 = new JButton("START");
JButton jb3 = new JButton("STOP");
JButton jb2 = new JButton("NEXT");
JPanel jp1 = new JPanel();
//构造方法
public StopWatch() {
jf.setSize(500, 400); //定义form大小
jf.setVisible(true);
jf.setResizable(false);
jtf.setPreferredSize(new Dimension(300, 25)); //定义jtf的首选大小jp1.setPreferredSize(new Dimension(300, 25)); //定义jp1的首选大小jta.setPreferredSize(new Dimension(300, 25)); //定义jta的首选大小jta.setBackground(Color.GREEN);
jf.add(jtf, BorderLayout.NORTH);
jf.add(jta, BorderLayout.CENTER);
jf.add(jp1, BorderLayout.SOUTH);
jp1.setLayout(new GridLayout(1, 4));
jp1.add(jb1);
jp1.add(jb2);
jp1.add(jb3);
jp1.add(jb4);
jb1.addActionListener(new Listener());
jb2.addActionListener(new Listener());
jb3.addActionListener(new Listener());
jb4.addActionListener(new Listener());
}
// 为""添加Listener类
class Listener implements ActionListener {
//实例化线程
Thread secTime = new Thread(new MilSec());
int i = 0;
public void actionPerformed(ActionEvent e) {
Object tag = e.getSource();
if(tag == jb4){
jtf.setText(""); //清空jtf时间
if(!jta.getText().equals("")){
jta.setText("记录已清空"); //清空jta记录}
} else if(tag == jb1){
if(jtf.getText().equals("")){
secStart = true; //秒表线程启动标志true；
} secTime.start(); //启动秒表线程
jta.setText("");
} else if(tag == jb3){
if(secStart == true) {
secStart = false;
}
} else if(tag == jb2){
i++; //名次计算
if(!secStart) {
jta.setText("操作有误，请按START键开始");
} else {
jta.setText(jta.getText() + "第" + i + "名" + jtf.getText() + '\n' + '\n');
}
}
}
}
// 定义秒表开始的线程类
class MilSec implements Runnable {
private int milsec = 0;
private int sec = 0;
private int min = 0;
public void run() {
while (secStart) {
milsec++;
if(milsec == 100) {
milsec = 0;
sec = sec + 1;
if(sec == 60) {
sec = 0;
min = min + 1;
}
}
jtf.setText("现在时间为：" +Integer.toString(min) + ":" + Integer.toString(sec)+ ":"
+Integer.toString(milsec) );
//设置毫秒数
try {
Thread.sleep(5);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(milsec);
System.out.println(sec);
System.out.println(min);
}
}
}
public static void main(String[] args) { new StopWatch();
}
}
代码运行结果图示：。