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();

}

}

java 倒计时的程序

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.KeyEvent;

import java.awt.event.KeyListener;

import java.util.Timer;

import java.util.TimerTask;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JTextField;

public class TimeThreadFrame extends JFrame{

// 定义组件

private JLabel lblTime;

private JTextField txtInput;

private JButton btnEnter;

// 构造方法

public TimeThreadFrame(){

// 设置窗体的相关属性

super("TimerThread");

this.setSize(300,200);

this.setLayout(null);

this.setLocation(100,50);

// 创建组件

this.lblTime = new JLabel("请输入倒计时时间");

this.lblTime.setBounds(30,20,200,30);

this.txtInput = new JTextField();

this.txtInput.setBounds(30,70,100,30);

this.btnEnter = new JButton("确定");

this.btnEnter.setBounds(150,70,70,30);

// 给JTextField注册监听

this.txtInput.addKeyListener(new KeyListener(){

public void keyPressed(KeyEvent ke) {

}

public void keyReleased(KeyEvent ke) {

}

public void keyTyped(KeyEvent ke) {

txtInput_KeyTyped(ke);

}

});

// 给JButton注册监听

this.btnEnter.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent ae){

btnEnter_ActionPerformed(ae);

}

});

// 将各组件添加到窗体上

add(lblTime);

add(txtInput);

add(btnEnter);

// 显示窗体

this.setVisible(true);

}

// 输入时的事件处理，控制用户只能输入数字

public void txtInput_KeyTyped(KeyEvent ke){

if(ke.getKeyChar() '0' || ke.getKeyChar() '9'){

ke.setKeyChar('\0');

}

}

// 点击按钮时的事件处理，核心！

public void btnEnter_ActionPerformed(ActionEvent ae){

// 获得用户输入的倒计时时间

String strTime = this.txtInput.getText();

if(strTime.equals("")){

// 检测用户是否输入

this.lblTime.setText("您尚未输入，请输入！");

}

else{

Integer time = Integer.parseInt(strTime);

// 创建线程

TimeThread tt = new TimeThread(this.lblTime,time);

tt.start();

// 创建Timer

Timer timer = new Timer();

timer.schedule(new TimerTask(){

// 启动其他程序

public void run() {

System.out.print("ok");

}

}, time * 1000);

}

}

// 启动窗体

public static void main(String[] args){

new TimeThreadFrame();

}

}

// 时间线程类

class TimeThread extends Thread{

private JLabel lblTime;

private int time;

// 构造方法传入，显示事件的JLabel和倒计时的时间。

public TimeThread(JLabel lblTime, int time){

this.lblTime = lblTime;

this.time = time;

}

// run方法

public void run(){

while(time 0){

// 显示所剩时间

this.lblTime.setText("所剩时间：" + time);

// 所剩时间减少

time--;

try {

this.sleep(1000);

} catch (InterruptedException e) {

e.printStackTrace();

}

}

}

}

满意请采纳。

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(); } } } }}

求JAVA 使用 Thread 和 Timer 类来做倒计时的程序代码

抱歉，之前没看到第二个条件，重新写了下。 在本机上可以正确运行。 import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyEvent; import java.awt.event.KeyListener; import java.io.IOException; import java.util.Timer; import java.util.TimerTask; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JTextField; public class TimeThreadFrame extends JFrame{ // 定义组件 private JLabel lblTime; private JTextField txtInput; private JButton btnEnter; // 记录所要启动的程序 private Process runningProcess; // 构造方法 public TimeThreadFrame(){ // 设置窗体的相关属性 super("TimerThread"); this.setSize(300,200); this.setLayout(null); this.setLocation(100,50); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // 创建组件 this.lblTime = new JLabel("请输入倒计时时间"); this.lblTime.setBounds(30,20,200,30); this.txtInput = new JTextField(); this.txtInput.setBounds(30,70,100,30); this.btnEnter = new JButton("确定"); this.btnEnter.setBounds(150,70,70,30); this.runningProcess = null; // 给JTextField注册监听 this.txtInput.addKeyListener(new KeyListener(){ public void keyPressed(KeyEvent ke) { } public void keyReleased(KeyEvent ke) { } public void keyTyped(KeyEvent ke) { txtInput_KeyTyped(ke); } }); // 给JButton注册监听 this.btnEnter.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent ae){ btnEnter_ActionPerformed(ae); } }); // 将各组件添加到窗体上 add(lblTime); add(txtInput); add(btnEnter); // 显示窗体 this.setVisible(true); } // 输入时的事件处理，控制用户只能输入数字 public void txtInput_KeyTyped(KeyEvent ke){ if(ke.getKeyChar() '0' || ke.getKeyChar() '9'){ ke.setKeyChar('\0'); } } // 点击按钮时的事件处理，核心！ public void btnEnter_ActionPerformed(ActionEvent ae){ // 获得用户输入的倒计时时间 String strTime = this.txtInput.getText(); if(strTime.equals("")){ // 检测用户是否输入 this.lblTime.setText("您尚未输入，请输入！"); } else{ Integer time = Integer.parseInt(strTime); // 创建线程 TimeThread tt = new TimeThread(this.lblTime,time); tt.start(); // 创建Timer Timer timer = new Timer(); timer.schedule(new TimerTask(){ // 启动其他程序 public void run() { try { // 当程序不存在时，会进行创建；存在时直接调用。 runningProcess = Runtime.getRuntime().exec("D:\\Program Files\\Tencent\\QQDoctor\\QQDoctor.exe"); } catch (IOException e) { e.printStackTrace(); } } }, time * 1000); } } // 启动窗体 public static void main(String[] args){ TimeThreadFrame ttf = new TimeThreadFrame(); } } // 时间线程类 class TimeThread extends Thread{ private JLabel lblTime; private int time; // 构造方法传入，显示事件的JLabel和倒计时的时间。 public TimeThread(JLabel lblTime, int time){ this.lblTime = lblTime; this.time = time; } // run方法 public void run(){ while(time 0){ // 显示所剩时间 this.lblTime.setText("所剩时间：" + time); // 所剩时间减少 time--; try { this.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } } } }

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