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使用重入锁 ReentrantLock先来获得,.newCondition对象,Condition 可以用来指定队列,唤醒指定队列中的线程,这样在多线程环境下会有更高的效率;
package morning;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
//4.三个线程交替输出A B C ,输出20遍。
public class Lock_Condition_ABC {
private static Lock lock = new ReentrantLock();
private static Condition A = lock.newCondition();
private static Condition B = lock.newCondition();
private static Condition C = lock.newCondition();
private static int count = 0;
private static int sum=1;
static class ThreadA extends Thread {
@Override
public void run() {
try {
lock.lock();
for (int i = 0; i < 10; i++) {
while (count % 3 != 0){//注意这里是不等于0,也就是说没轮到该线程执行,之前一直等待状态
A.await(); //该线程A将会释放lock锁,构造成节点加入等待队列并进入等待状态
}
System.out.println("-------第"+sum+"次--------");
System.out.println("A");
count++;
B.signal(); // A执行完唤醒B线程
}
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
lock.unlock();
}
}
}
static class ThreadB extends Thread {
@Override
public void run() {
try {
lock.lock();
for (int i = 0; i < 10; i++) {
while (count % 3 != 1)
B.await();// B释放lock锁,当前面A线程执行后会通过B.signal()唤醒该线程
System.out.println("B");
count++;
C.signal();// B执行完唤醒C线程
}
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
lock.unlock();
}
}
}
static class ThreadC extends Thread {
@Override
public void run() {
try {
lock.lock();
for (int i = 0; i < 10; i++) {
while (count % 3 != 2)
C.await();// C释放lock锁
System.out.println("C");
count++;
sum++;
A.signal();// C执行完唤醒A线程
}
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
lock.unlock();
}
}
}
public static void main(String[] args) throws InterruptedException {
new ThreadA().start();
new ThreadB().start();
new ThreadC().start();
}
}
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