java计时器类(java定时器)
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();
}
}
}
}
JAVA计时器
/** 每3秒运行一次 */
Timer timer = new Timer();
TimerTask tt = new TimerTask() {
public void run() {
/* 投放炸弹的操作 */
new Thread() {
public void run() {
try {
Thread.sleep(5000);
}catch (Exception e) { }
/* 爆炸的操作 */
}
}.start();
}
}; timer.schedule(tt, 0, 3000);
用到了Java中的计时器类，哪儿错了呀
预览图
导包错误:
java.util.*;里面也有个Timer ,但这并不是我们需要的swing的Timer
修改办法. 再导入一个包
import javax.swing.Timer;
如何用java实现一个计时器？
用java实现一个计时器的方法：
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
}
}
}
JAVA计时器，怎么写
import java.awt.BorderLayout;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class TimeCount extends JFrame implements ActionListener{
ThreadCount tc=new ThreadCount(this);
Thread thread=new Thread(tc);
JPanel panelN=new JPanel(),panelC=new JPanel();
JLabel label=new JLabel("计时器");
JButton butnStart=new JButton("开始");
boolean toEnd;
public TimeCount() {
setBounds(100,100,300,300);
setVisible(true);
label.setFont(new Font(null,Font.BOLD,22));
panelN.add(label);
add(panelN,BorderLayout.NORTH);
panelC.add(butnStart);
add(panelC,BorderLayout.CENTER);
butnStart.addActionListener(this);
validate();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public void actionPerformed(ActionEvent arg0) {
if(arg0.getSource()==butnStart){
if(!thread.isAlive()){
thread=new Thread(tc);
thread.start();
}else {
toEnd=true;
}
}
}
public static void main(String[] args) {
new TimeCount();
}
}
class ThreadCount implements Runnable{
TimeCount lc;
public ThreadCount(TimeCount lc) {
super();
this.lc = lc;
}
public void run() {
int i=1;
while(true){
if(lc.toEnd){
lc.toEnd=false;
lc.butnStart.setText("开始");
return;
}
try {
Thread.sleep(2);
} catch (InterruptedException e) {
// TODO: handle exception
}
i+=2;
int min=i/60000;
int second=(i%60000)/1000;
int mm=i%1000;
String show="";
if(min0)
show+=min+":";
if(second0)
show+=second+".";
show+=mm;
lc.label.setText(show);
}
}
}
满意请采纳。