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(); } } } }}
专业领域包括网站制作、成都网站设计、电子商务商城网站建设、微信营销、系统平台开发， 与其他网站设计及系统开发公司不同，成都创新互联公司的整合解决方案结合了帮做网络品牌建设经验和互联网整合营销的理念，并将策略和执行紧密结合，为客户提供全网互联网整合方案。
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
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
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;
}
}
}
}
