在书上看到了一个好方法，当多个线程并发时，可以用scheduleAtFixedRate来管理,scheduleAtFixedRate定时执行一次任务,是重复执行,而ScheduledThreadPoolExecutor将只执行一次任务，
如果你有多个任务，同时进行，并且，是定时的执行，那么以下的程序，完全可以满足你的要求：
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import
java.util.concurrent.*; import
java.util.*; public
class TestGreenhouseScheduler {
private
volatile boolean
light = false;
private
volatile boolean
water = false;
private
String thermostat = "Day";
public
synchronized String getThermostat() {
return
thermostat; }
public
synchronized void
setThermostat(String value) {
thermostat = value; }
//运行一次任务
ScheduledThreadPoolExecutor scheduler =
new ScheduledThreadPoolExecutor(10);
public
void schedule(Runnable event,
long delay) {
scheduler.schedule(event, delay, TimeUnit.MILLISECONDS);
}
public
void repeat(Runnable event,
long initialDelay,
long period) {
//scheduleAtFixedRate 定时执行一次任务,是重复执行
scheduler.scheduleAtFixedRate(event, initialDelay, period,
TimeUnit.MILLISECONDS); }
class
LightOn implements
Runnable {
int j=0;
public void
run() {
// Put hardware control code here to
// physically turn on the light.
System.out.println("Turning on lights"+"执行了"+(j++));
light = true;
} }
class
LightOff implements
Runnable {
public void
run() {
// Put hardware control code here to
// physically turn off the light.
System.out.println("Turning off lights");
light = false;
} }
class
WaterOn implements
Runnable {
public void
run() {
// Put hardware control code here.
System.out.println("Turning greenhouse water on");
water = true;
} }
class
WaterOff implements
Runnable {
public void
run() {
// Put hardware control code here.
System.out.println("Turning greenhouse water off");
water = false;
} }
class
ThermostatNight implements
Runnable {
int j=0;
public void
run() {
// Put hardware control code here.
System.out.println("Thermostat to night setting"+"执行了"+(j++));
setThermostat("Night");
} }
class
ThermostatDay implements
Runnable {
public void
run() {
// Put hardware control code here.
System.out.println("Thermostat to day setting");
setThermostat("Day");
} }
class
Bell implements
Runnable {
int j= 0;
public void
run() {
System.out.println("Bing!"+"执行了"+(j++));
} }
class
Terminate implements
Runnable {
public void
run() {
System.out.println("Terminating");
scheduler.shutdownNow(); //结束线程
// Must start a separate task to do this job,
// since the scheduler has been shut down:
new
Thread() {
public void
run() {
//最后一次执行
System.out.println("nowww");
}
}.start();
} }
public
static void
main(String[] args) {
TestGreenhouseScheduler gh = new
TestGreenhouseScheduler();
gh.schedule(gh.new
Terminate(), 1000*7);
//7秒运行一次任务，这里只执行一次
gh.repeat(gh.new
Bell(), 0,
1000);//1秒执行一次任务,是重复执行
gh.repeat(gh.new
ThermostatNight(), 0,
2000);
gh.repeat(gh.new
LightOn(), 0,
3000);
}
} ---结果7秒之后，结束所有的线程，你看Bing执行了7次---
Bing!执行了0Thermostat to night setting执行了0Turning on lights执行了0Bing!执行了1Thermostat to night setting执行了1Bing!执行了2Bing!执行了3Turning on lights执行了1Bing!执行了4Thermostat to night setting执行了2Bing!执行了5Bing!执行了6Thermostat to night setting执行了3Turning on lights执行了2Terminating
Bing!执行了7nowww |
原文：http://blog.csdn.net/u014311042/article/details/41846489