初识java.util.concurrent.CountDownLatch
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package learn;
import java.util.concurrent.Callable;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
public class CountDown {
public static int num = 10;
public static void main(String[] args) throws InterruptedException {
//所有任务线程执行结束信号
CountDownLatch doneSignal = new CountDownLatch(num);
//任务执行信号
CountDownLatch startSignal = new CountDownLatch(1);
ExecutorService service = Executors.newCachedThreadPool();
for (int i = 1; i <= num; i++)
{
service.submit(new Worker(doneSignal, startSignal, i));
}
System.out.println("begin ***********************");
//任务开始执行
startSignal.countDown();
//等待所有任务执行结束
doneSignal.await();
service.shutdown();
System.out.println("Done ***********************");
}
static class Worker implements Callable<Object>
{
private CountDownLatch doneSignal;
private CountDownLatch startSignal;
private int index;
Worker(CountDownLatch doneSignal, CountDownLatch startSignal, int index)
{
this.doneSignal = doneSignal;
this.startSignal = startSignal;
this.index = index;
}
@Override
public Object call()
{
try
{
//等待任务执行信号
startSignal.await();
for (int i = (index - 1) * 10 + 1; i <= index * 10; i++)
{
System.out.println("worker(" + index + ") print " + i);
}
}
catch (InterruptedException e) {
e.printStackTrace();
}
finally
{
//任务执行结束信号
doneSignal.countDown();
}
return null;
}
}
}
import java.util.concurrent.Callable;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
public class CountDown {
public static int num = 10;
public static void main(String[] args) throws InterruptedException {
//所有任务线程执行结束信号
CountDownLatch doneSignal = new CountDownLatch(num);
//任务执行信号
CountDownLatch startSignal = new CountDownLatch(1);
ExecutorService service = Executors.newCachedThreadPool();
for (int i = 1; i <= num; i++)
{
service.submit(new Worker(doneSignal, startSignal, i));
}
System.out.println("begin ***********************");
//任务开始执行
startSignal.countDown();
//等待所有任务执行结束
doneSignal.await();
service.shutdown();
System.out.println("Done ***********************");
}
static class Worker implements Callable<Object>
{
private CountDownLatch doneSignal;
private CountDownLatch startSignal;
private int index;
Worker(CountDownLatch doneSignal, CountDownLatch startSignal, int index)
{
this.doneSignal = doneSignal;
this.startSignal = startSignal;
this.index = index;
}
@Override
public Object call()
{
try
{
//等待任务执行信号
startSignal.await();
for (int i = (index - 1) * 10 + 1; i <= index * 10; i++)
{
System.out.println("worker(" + index + ") print " + i);
}
}
catch (InterruptedException e) {
e.printStackTrace();
}
finally
{
//任务执行结束信号
doneSignal.countDown();
}
return null;
}
}
}
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