Question

求完整简单的java计时器小程序代码，急！！

1：拥有完整的图形界面
2：有开始计时，停止计时，记录时间三个按钮并且可以运行
3：在每条语句后面加上注释
4：功能方面就是点击开始计时，设置的时间开始滚动，点击记录时间，当前滚动的时间被记录下来，停止时间就不用多说了
5：最终程序可以完美运行

Answer 1

import java.awt.Button;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.PopupMenu;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.Timer;

public class jishiqi extends JFrame {
final TextField txt = new TextField(10);
JLabel lbl = new JLabel();
// JLabel lb2 = new JLabel();
Date now = new Date();

public jishiqi() {
now.setHours(0);
now.setMinutes(0);
now.setSeconds(0);
final Timer timer = new Timer(1000, new ActionListener() {
public void actionPerformed(ActionEvent e) {
Date now2 = new Date(now.getTime() + 1000);
now = now2;
SimpleDateFormat formatter = new SimpleDateFormat("HH:mm:ss");
lbl.setText(formatter.format(now));
}
});

Button b1 = new Button("开始计时");
Button b2 = new Button("停止计时");
Button b3 = new Button("记录时间");
b3.setBounds(50, 50, 50, 50);
b2.setBounds(40, 40, 40, 40);
b1.setBounds(30, 30, 30, 30);

b1.addActionListener(new ActionListener() {

@Override
public void actionPerformed(ActionEvent e) {

Button b = (Button) e.getSource();
b.setLabel("开始计时");
timer.start();

b.setBackground(Color.yellow);
}
});

b2.addActionListener(new ActionListener() {

@Override
public void actionPerformed(ActionEvent e) {

Button b = (Button) e.getSource();
b.setLabel("停止计时");
timer.stop();
b.setBackground(Color.yellow);
}
});

b3.addActionListener(new ActionListener() {

@Override
public void actionPerformed(ActionEvent e) {

// Button b = (Button) e.getSource();

Date now3 = new Date(now.getTime() + 1000);
now = now3;
SimpleDateFormat formatter = new SimpleDateFormat("HH:mm:ss");
// String s=(new
// SimpleDateFormat("yyyy-MM-dd")).format(Calendar.getInstance().getTime());

String s = formatter.format(now).toString();
txt.setText(s);
Button b = (Button) e.getSource();
b.setLabel("记录时间");

b.setBackground(Color.yellow);
}
});

this.setLayout(new FlowLayout());
this.add(txt);
this.add(b3);
this.add(b2);
this.add(b1);
this.add(lbl);

this.setSize(300, 200);
this.setVisible(true);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
}

public static void main(String[] args) {
jishiqi t = new jishiqi();
}
}
差不多了，界面你自己优化一下吧。