写一个计时器 JAVA代码是什么？

应该用线程里面的Timer来控制package com.sy.game.test;

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import java.util.Timer;

import java.util.TimerTask;

public class TimeTask {

public static void main(String[] args) {

TimeTask tTask=new TimeTask();

tTask.timeVoid();

}

public void timeVoid(){

final Timer timer = new Timer();

TimerTask tt=new TimerTask() {

@Override

public void run() {

System.out.println("到点啦!");

timer.cancel();

}

};

timer.schedule(tt, 3000);

}

}

整合的：

/*

* java倒计时器

* shiyang

* */

package com.sy.game.test;

import java.awt.Container;

import java.awt.FlowLayout;

import java.awt.Toolkit;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JTextField;

import javax.swing.Timer;

@SuppressWarnings("unused")

public class TimeController extends JFrame implements ActionListener {

private static final long serialVersionUID = 4603262282860990473L;

private static final int DEFAULT_WIDTH = 200;

private static final int DEFAULT_HEIGHT = 100;

private static final int width = Toolkit.getDefaultToolkit()

.getScreenSize().width;

private static final int height = Toolkit.getDefaultToolkit()

.getScreenSize().height;

private Container container;

private JButton btn;

private JTextField jtfTime;

private Timer tmr;

public TimeController() {

initComponents();

Timer tmr = new Timer(1000, this);

this.tmr = tmr;

setVisible(true);

}

private void initComponents() {

this.setTitle("SY秒表");

this.setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

this.setResizable(false);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.setLocation((width - DEFAULT_WIDTH) / 2,

(height - DEFAULT_HEIGHT) / 2);

jtfTime = new JTextField("10");

btn = new JButton("开始倒计时");

container = getContentPane();

JPanel panel = new JPanel();

panel.add(btn);

panel.add(jtfTime);

this.add(panel);

btn.addActionListener(this);

}

public void actionPerformed(ActionEvent ae) {

if (ae.getSource() == btn) {

jtfTime.setText("10");

tmr.start();

} else {

int t;

t = Integer.parseInt(jtfTime.getText());

t--;

jtfTime.setText("" + t);

if (t = 0) {

tmr.stop();

}

}

}

public static void main(String[] args) {

TimeController timeController = new TimeController();

}

}

求java的计时器代码，应该比较简单的，来看看吧。

package test;

import java.util.*;

import java.awt.*;

import java.awt.event.*;

import java.applet.*;

public class Test5 extends Applet {

private final Panel pan = new Panel();

private final Label time = new Label();

private final Button btnGo = new Button("开始");

private final Button btnPouse = new Button("暂停");

private final Button btnReset = new Button("复位");

private final StopwatchThread swThread = new StopwatchThread();

private class btnGoListener implements ActionListener {

public void actionPerformed(ActionEvent e) {

   

swThread.go();

btnGo.setEnabled(false);

}

}

private class btnPouseListener implements ActionListener {

public void actionPerformed(ActionEvent e) {

   if(btnGo.isEnabled()){

   return ;

   }

 if (btnPouse.getLabel().equals("继续")) {

swThread.go();

btnPouse.setLabel("暂停");

} else if (btnPouse.getLabel().equals("暂停")) {

swThread.noGo();

btnPouse.setLabel("继续");

}

}

}

private class btnResetListener implements ActionListener {

public void actionPerformed(ActionEvent e) {

swThread.reset();

btnGo.setEnabled(true);

btnGo.setLabel("开始");

btnPouse.setLabel("暂停");

}

}

private class StopwatchThread extends Thread {

private boolean going = false;

private long prevElapsed = 0;

private Date startDate = new Date();

private long elapsedTime() {

return prevElapsed +

(going ? new Date().getTime() - startDate.getTime() : 0);

}

private String msToString(long time) {

   System.out.println(time+"  "+((0*60+2)*1000+999));

if(((99*60+59)*1000+983)=time((99*60+59)*1000+999)=time){//((0*60+2)*1000+983)=time((0*60+2)*1000+999)=time

if (time % 1000  990)

time += 2;

swThread.noGo();

}

String ms, sec, min;

if (time % 10 = 5)

time += 5;

ms = Long.toString(time % 1000);

while (ms.length()  3)

ms = "0" + ms;

ms = ms.substring(0, ms.length() - 1);

time /= 1000;

sec = Long.toString(time % 60);

if (sec.length() == 1) sec = "0" + sec;

time /= 60;

min = Long.toString(time);

return min + ":" + sec + "." + ms;

}

public void go() {

startDate = new Date();

going = true;

}

public void noGo() {

prevElapsed = elapsedTime();

going = false;

}

public void reset() {

going = false;

prevElapsed = 0;

}

public void run() {

while (true) {

time.setText(msToString(elapsedTime()));

yield();

}

}

}

public void init() {

setLayout(new GridLayout(2,2));

setBackground(Color.lightGray);

setForeground(Color.black);

pan.setLayout(new GridLayout(3,2));

pan.add(new Label("计时:"));

time.setForeground(Color.blue);

pan.add(time);

pan.add(btnGo);

pan.add(btnPouse);

pan.add(btnReset);

pan.add(new Label());

add(pan);

btnGo.addActionListener(new btnGoListener());

btnReset.addActionListener(new btnResetListener());

btnPouse.addActionListener(new btnPouseListener());

swThread.setDaemon(true);

swThread.start();

}

public static void main(String[] args) {

Test5 applet = new Test5();

Frame aFrame = new Frame("计时器");

aFrame.addWindowListener(new WindowAdapter() {

public void windowClosing(WindowEvent e) {

System.exit(0);

}

});

aFrame.add(applet, BorderLayout.CENTER);

aFrame.setSize(400, 200);

applet.init();

applet.start();

aFrame.setVisible(true);

}

}

可以改变有注释的那个if语句里面的值来判断什么时候停止

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(); } } } }}

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