转自：https://www.cnblogs.com/java-zzl/p/9741288.html
一、通过SynchronousQueue方式实现线程间数据传递：
线程A与线程B共同持有一个SynchronousQueue的引用，线程B调用take方法，阻塞以等待； 线程A运行后计算出结果，将结果put到queue中;
public class SynchronousQueueTest {
public static void main(String[] args) throws InterruptedException {
SynchronousQueue<Integer> queue = new SynchronousQueue<Integer>();
//线程A putThread
Thread putThread = new Thread(new Runnable() {
@Override
public void run() {
System.out.println("put thread start");
try {
Thread.sleep(3000);
System.out.println("put thread put对象");
queue.put(1);
} catch (InterruptedException e) {
}
System.out.println("put thread end");
}
});
//线程B takeThread
Thread takeThread = new Thread(new Runnable() {
@Override
public void run() {
System.out.println("take thread start");
try {
System.out.println("take thread 等待put对象");
System.out.println("take from putThread: " + queue.take());
} catch (InterruptedException e) {
}
System.out.println("take thread end");
}
});
putThread.start();
takeThread.start();
}
}
二、线程Exchanger工具类实现线程间的数据交换：
当一个线程到达exchange调用点时，如果它的伙伴线程此前已经调用了此方法，那么它的伙伴会被调度唤醒并与之进行对象交换，然后各自返回。如果它的伙伴还没到达交换点，那么当前线程将会被挂起，直至伙伴线程到达——完成交换正常返回；或者当前线程被中断——抛出中断异常；又或者是等候超时——抛出超时异常。
public class ExchangerTest {
public static void main(String[] args) {
ExecutorService service = Executors.newCachedThreadPool();
final Exchanger exchanger = new Exchanger();
service.execute(new Runnable(){
public void run() {
try {
String data1 = "thread-1-data";
System.out.println("线程" + Thread.currentThread().getName() +"正在把数据" + data1 +"换出去");
Thread.sleep((long)(Math.random()*10000));
String data2 = (String)exchanger.exchange(data1);
System.out.println("线程" + Thread.currentThread().getName() + "换回的数据为" + data2);
}catch(Exception e){
}
}
});
service.execute(new Runnable(){
public void run() {
try {
String data1 = "thread-2-data";
System.out.println("线程" + Thread.currentThread().getName() + "正在把数据" + data1 +"换出去");
Thread.sleep((long)(Math.random()*10000));
String data2 = (String)exchanger.exchange(data1);
System.out.println("线程" + Thread.currentThread().getName() + "换回的数据为" + data2);
}catch(Exception e){
}
}
});
}
}