java中使用线程实现Timer（定时器）原理和源码

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2007年06月21日 14:44:00

下载源码和示例

1 原理：启动一个线程来刷时间，缺点是不太精确，可能跟线程的优先级有关系。

会有0-10ms的误差。精确到0.1s是没有问题的。

package timer;

public class Timer {

private long interval;

// private boolean enabled;

private Task task;

private Clock clock;

public Timer(long _interval, Task _task) {

super();

this.interval = _interval;

// this.enabled = enabled;

this.task = _task;

clock = new Clock();

clock.start();

new Thread(new Runnable() {

public void run() {

boolean b = true;

while (b) {

//System.out.println(clock.getCurrTime());

if (interval >= clock.getCurrTime()) {

System.out.println(clock.getCurrTime());

task.doit();

clock.setCurrTime(0);

//clock.stop();

//System.out.println(clock.getCurrTime());

//b = false;

}

}).start();

}

public Task getTask() {

return task;

}

public long getInterval() {

return interval;

}

// public boolean isEnabled() {

// return enabled;

// }

// public void setEnabled(boolean enabled) {

// this.enabled = enabled;

// }

}

package timer;

public class Clock extends Thread {

private long oldTime;

private long currTime;

public Clock() {

oldTime = System.currentTimeMillis();

currTime = 0;

}

public long getCurrTime() {

return currTime;

}

@Override

public void run() {

while (true) {

currTime = System.currentTimeMillis() - oldTime;

}

public void setCurrTime(long currTime) {

this.currTime = currTime;

}

package timer;

public interface Task {

void doit();

}

package timer;

public class NewTask implements Task {

public void doit() {

System.out.println( System.currentTimeMillis() );

}

package timer;

public class Test {

/**

* @param args

public static void main(String[] args) {

Task task = new NewTask();

Timer t = new Timer(1000,task);

}

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