如何用java实现一个计时器？

用java实现一个计时器的方法：

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public class TestDingShi implements Runnable

{

Thread xc;

Dao dao=new DaoImpl();

public TestDingShi()

{

xc=new Thread(this);//线程开启

xc.start();

}

public void run()

{

while (true)

{

try

{

xc.sleep(1000);//睡眠开始计时

}

catch (InterruptedException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

//TODO定时在此

}

}

}

用JAVA编写计时器

计时器可以使用timer类也可以使用线程类来操作，下面是Thread做的简单的计时器

public class Calculagraph extends Thread {

public static void main(String[] args) {

new Calculagraph().start();

}

private long now = 0l;

private long start = System.currentTimeMillis();// 程序启动时间的毫秒值

private long time;

public void run() {

while (true) {

now = System.currentTimeMillis();// 获取一秒之后的毫秒值

time = now - start;// 两个时间相减的到毫秒差

System.out.format("%02d:%02d:%02d\n",

time / (1000 * 60 * 60) % 60/* 时 */, 

time / (1000 * 60)% 60/* 分 */, 

time / 1000 % 60/* 秒 */);// 格式化字符串输出

try {

Thread.sleep(1000);

} catch (InterruptedException e) {

e.printStackTrace();

}

}

}

}

用java编写一个倒计时器代码。

import java.awt.BorderLayout;import java.awt.Container;import java.awt.Font;import java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JOptionPane;import javax.swing.JPanel;import javax.swing.JTextField;public class TimerDemo extends JFrame implements ActionListener { private static final long serialVersionUID = 201306211111L; private JTextField screen = new JTextField("0"); private JButton start = new JButton("开始"); private JButton reset = new JButton("重置"); private JPanel panel = new JPanel(); private boolean isRunning; private int time; private int timeBetween; public TimerDemo(int timeBetween) { super("计时器"); this.timeBetween = timeBetween; try { init(); } catch (Exception e) { e.printStackTrace(); } } public TimerDemo() { super("计时器"); this.timeBetween = 100; try { init(); } catch (Exception e) { e.printStackTrace(); } } private void init() { panel.setLayout(new GridLayout()); panel.add(start); panel.add(reset); start.addActionListener(this); reset.addActionListener(this); screen.setFont(new Font("幼圆", Font.BOLD, 60)); screen.setHorizontalAlignment(JTextField.CENTER); screen.setEditable(false); Container c = getContentPane(); c.setLayout(new BorderLayout()); c.add(panel, BorderLayout.SOUTH); c.add(screen, BorderLayout.CENTER); this.setSize(200, 150); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setResizable(false); this.setLocationRelativeTo(null); this.setVisible(true); } public static void main(String[] args) { new TimerDemo(1);// 设定 1ms/次 // new TimerDemo(); } @Override public void actionPerformed(ActionEvent e) { if (e.getSource() == start) { if (start.getText().equals("开始")) { start.setText("暂停"); isRunning = true; } else if (start.getText().equals("暂停")) { start.setText("开始"); isRunning = false; } } if (e.getSource() == reset) { start.setText("开始"); screen.setText("0"); isRunning = false; time = 0; } new Thread(new TimeZone()).start(); } class TimeZone implements Runnable { @Override public void run() { while (isRunning) { time++; if (time = Integer.MAX_VALUE) { screen.setText("ERROR"); JOptionPane.showMessageDialog(null, "ERROR"); isRunning = false; } screen.setText(String.valueOf(time)); try { Thread.sleep(timeBetween); } catch (Exception e) { e.printStackTrace(); } } } }}

文章题目：java代码计时器 java做一个可以计时的秒表
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