钟表倒计时Java代码 java精准到秒的倒计时

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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怎么编写一个倒计时的java的程序？求具体步骤！

基于控制台的话很简单的，我跟你说一下大体思路吧，二话不说先来个for循环，然后输出倒计时的数字，程序睡一秒，在输出倒计时数字，如此循环，简单吧，下面看程序：

public static void main(String[] args) {

for(int i=10;i0;i--){

System.out.print(i+" ");

try {

Thread.sleep(1000);

} catch (InterruptedException e) {

e.printStackTrace();

}

}

System.err.print("爆炸");

}

其他基于网页的还是基于用户界面都可以使用这个思路的

怎么在页面显示5分钟的倒计时 用java代码

给你一个javascript 5秒 倒计时的例子。

title无标题文档/title

script type="text/javascript"

var totalTime=parseInt(6);

function countDown(){

if(totalTime==0){

return;

}else{

totalTime=totalTime-1;

window.document.form1.timeText.value=totalTime;

setTimeout("countDown()",1000);

}

}

/script

/head

body

form name="form1"

input type="text" name="timeText" /

input type="button" value="start" onclick="countDown();"

/form

/body

/html

如果用java实现web 倒计时，那么就一种后果，不断的刷新页面。除非用ajax 或者 javascript 还有一个就是 applet。 有啥问题可以hi我交流

谁有用java的application编写的倒计时钟代码?

package hello;

import java.awt.*;

import java.applet.*;

import java.awt.event.*;

import java.util.*;

import java.awt.geom.*;

public class T extends Applet implements Runnable{

Thread tHour = null,tMinute = null,tSecond = null;//表示时针，分针和秒针的线程

int hour_a,hour_b,minute_a,minute_b,second_a,second_b;//表示时针，分针，秒针端点的整型变量

int hour = 0,minute = 0,second = 0;//获取当前时间的整型变量

//绘制时针，分针和秒针的Graphics对象

Graphics g_second = null,g_minute = null,g_hour =null;

//存放表盘刻度的数组，供指针走动时使用

double point_x[] = new double[61],point_y[] = new double[61];

//存放表盘刻度的数组，供绘制表盘使用

double scaled_x[] = new double[61],scaled_y[] = new double[61];

//判断小程序是否重新开始的变量

int start_count = 0;

public void init(){

g_hour = this.getGraphics();

g_hour.setColor(Color.CYAN);

g_second = this.getGraphics();

g_second.setColor(Color.RED);

g_minute = this.getGraphics();

g_minute.setColor(Color.blue);

g_second.translate(200,200);//进行坐标系统变换，将新坐标系原点设在（200，200）处

g_minute.translate(200,200);

g_hour.translate(200,200);

point_x[0] = 0; point_y[0] = -120;//各个时针12点处的位置坐标（按新坐标系的坐标）

scaled_x[0] = 0;scaled_y[0] = -140;//12点处的刻度位置坐标（按新坐标系的坐标）

double jiaodu = 6*Math.PI/180;

//表盘分割成60分，将分割点的坐标存放在数组中

for(int i = 0; i 60; i++){

point_x[i+1] = point_x[i]*Math.cos(jiaodu)-Math.sin(jiaodu)*point_y[i];

point_y[i+1] = point_y[i]*Math.cos(jiaodu) + point_x[i]*Math.sin(jiaodu);

}

point_x[60] = 0; point_y[60] = -120;

for(int i = 0; i 60; i++){

scaled_x[i+1] = scaled_x[i]*Math.cos(jiaodu)-Math.sin(jiaodu)*scaled_y[i];

scaled_y[i+1] = scaled_y[i]*Math.cos(jiaodu) + Math.sin(jiaodu)*scaled_x[i];

}

scaled_x[60]= 0;

scaled_y[60] = -140;

}

public void start(){

//每当小程序重新开始时，首先消灭线程，然后重新开始创建线程

if(start_count = 1){

tSecond.interrupt();

tMinute.interrupt();

tHour.interrupt();

}

tSecond = new Thread(this);

tMinute = new Thread(this);

tHour = new Thread(this);

tSecond.start();

tMinute.start();

tHour.start();

start_count++;

if(start_count = 2) start_count = 1;

}

public void stop()

{

tSecond.interrupt();

tMinute.interrupt();

tHour.interrupt();

}

public void paint(Graphics g){

this.start();

g.drawOval(50,50,300,300);//表盘的外圈

g.translate(200,200);

//绘制表盘的小刻度和大刻度

for(int i = 0 ; i 60; i++){

if(i%5 == 0){

g.setColor(Color.BLACK);

g.fillOval((int) scaled_x[i],(int) scaled_y[i],10,10);

}

else

g.fillOval((int)scaled_x[i],(int)scaled_y[i],5,5);

}

}

public void run(){

//获取本地时间

Date date = new Date();

String s=date.toString();

hour=Integer.parseInt(s.substring(11,13));

minute = Integer.parseInt(s.substring(14,16));

second = Integer.parseInt(s.substring(17,19));

if(Thread.currentThread() == tSecond){

second_a =(int)point_x[second];

second_b = (int)point_x[second];

g_second.drawLine(0,0,second_a,second_b);//秒针的初始位置

g_second.drawString("秒",second_a,second_b);

int i = second;

while(true){

try{

tSecond.sleep(1000);

Color c = getBackground();

g_second.setColor(c);

g_second.drawLine(0,0,second_a,second_b);//用背景色清除前一秒时的秒针

g_second.drawString("秒",second_a,second_b);

//如果秒针与分针重合，恢复分针的显示

if((second_a == minute_a)(second_b == minute_b)){

g_minute.drawLine(0,0,minute_a,minute_b);

g_minute.drawString("分",minute_a,minute_b);

}

//如果秒针与时针重合，恢复时针的显示

if((second_a == hour_a)(second_b == hour_b)){

g_hour.drawLine(0,0,hour_a,hour_b);

g_hour.drawString("时",hour_a,hour_b);

}

}

catch(InterruptedException e){

Color c = getBackground();

g_second.setColor(c);

g_second.drawLine(0,0,second_a,second_b);//用背景色清除秒针

g_second.drawString("秒",second_a,second_b);

return;

}

//秒针向前走一个单位

second_a=(int)point_x[(i+1)%60];

second_b = (int)point_y[(i+1)%60]; //每一秒走6度（一个单位格）

g_second.setColor(Color.red);

g_second.drawLine(0,0,second_a,second_b);

g_second.drawString("秒",second_a,second_b);

i++;

}

}

if(Thread.currentThread() == tMinute){

minute_a = (int)point_x[minute];

minute_b = (int)point_y[minute];

g_minute.drawLine(0,0,minute_a,minute_b);

int i = minute;

while(true){

//第一次过60-second秒就前进一分钟，以后每过60秒前进一分钟

try{

tMinute.sleep(1000*60 - second*1000);

second = 0;

Color c = getBackground();

g_minute.setColor(c);

g_minute.drawLine(0,0,minute_a,minute_b);

g_minute.drawString("分",minute_a,minute_b);

if((hour_a == minute_a)(hour_b== minute_b)){

g_hour.drawLine(0,0,minute_a,minute_b);

g_hour.drawString("时",hour_a,hour_b);

}

}

catch(InterruptedException e){

return;

}

minute_a = (int)point_x[(i+1)%60];

minute_b = (int)point_y[(i+1)%60];

g_minute.setColor(Color.BLUE);

g_minute.drawLine(0,0,minute_a,minute_b);

g_minute.drawString("分",minute_a,minute_b);

i++; second = 0;

}

}

if(Thread.currentThread() == tHour){

int h = hour%12;

hour_a = (int)point_x[h*5 + minute/12];

hour_b = (int)point_y[h*5 + minute/12];

int i = h*5 + minute/12;

g_hour.drawLine(0,0,hour_a,hour_b);

g_hour.drawString("时",hour_a,hour_b);

while(true){

//第一次过12-minute%12分钟就前进一个刻度，以后每过12分钟前进一个刻度

try{

tHour.sleep(1000*60*12 - 1000*60*(minute%12) - second *1000);

minute = 0;

Color c = getBackground();

g_hour.setColor(c);

g_hour.drawLine(0,0,hour_a,hour_b);

g_hour.drawString("时",hour_a,hour_b);

}

catch(InterruptedException e){

return;

}

hour_a = (int)point_x[(i+1)%60];

hour_b = (int)point_y[(i+1)%60];

g_hour.setColor(Color.CYAN);

g_hour.drawLine(0,0,hour_a,hour_b);

g_hour.drawString("时",hour_a,hour_b);

i++;minute = 0;

}

}

}

}