java 補(bǔ)全代碼

樓主，依題意，完整的程序如下：

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import java.awt.FlowLayout;

import java.awt.Toolkit;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

public class Exam2 extends Thread implements ActionListener

{

//聲明界面元素

private JFrame timeFrame;

private JButton startButton;

private JButton stopButton;

private JButton resetButton;

private JLabel timeLabel;

//定義變量存儲(chǔ)時(shí)、分、秒

int hour = 0;

int minute = 0;

int second = 0;

//聲明線程對(duì)象

Thread myThread;

public Exam2()

{

timeFrame = new JFrame("計(jì)時(shí)器");

startButton = new JButton("開(kāi)始");

stopButton = new JButton("停止");

resetButton = new JButton("重置");

timeLabel = new JLabel("00:00:00");

timeFrame.setLayout(new FlowLayout());

timeFrame.setBounds((Toolkit.getDefaultToolkit().getScreenSize().width - 300)/2,

(Toolkit.getDefaultToolkit().getScreenSize().height - 200)/2, 300, 200);

timeFrame.add(timeLabel);

timeFrame.add(startButton);

timeFrame.add(stopButton);

timeFrame.add(resetButton);

timeFrame.setVisible(true);

timeFrame.addWindowListener(new WindowAdapter(){

public void windowClosing(WindowEvent e)

{

System.exit(0);

}

});

startButton.addActionListener(this);

stopButton.addActionListener(this);

resetButton.addActionListener(this);

myThread = this;

}

public void actionPerformed(ActionEvent e)

{

if(e.getSource() == this.startButton)

{

System.out.println("計(jì)時(shí)開(kāi)始...");

if(this.start)

{

this.myThread.start();

}

else

{

this.start = true;

}

}

if(e.getSource() == this.stopButton)

{

System.out.println("計(jì)時(shí)停止...");

this.start = false;

}

if(e.getSource() == this.resetButton)

{

hour = 0;

minute = 0;

second = 0;

}

}

volatile boolean start = true;

@Override

public void run()

{

while(true)

{

if(this.start)

{

second++;

try

{

Thread.sleep(1000);

} catch (InterruptedException e)

{

e.printStackTrace();

}

if(second = 60)

{

second = 0;

minute++;

}

if(minute = 60)

{

minute = 0;

hour++;

}

showTime();

}

}

}

private void showTime()

{

String strTime = "";

if(hour 10)

{

strTime += "0"+hour + ":";

}

else

{

strTime += hour + ":";

}

if(minute 10)

{

strTime += "0"+minute + ":";

}

else

{

strTime += minute + ":";

}

if(second 10)

{

strTime += "0"+second;

}

else

{

strTime += second;

}

this.timeLabel.setText(strTime);

}

public static void main(String[] args)

{

new Exam2();

}

}

有問(wèn)題歡迎提問(wèn)，滿意請(qǐng)采納，謝謝！

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