使用Lock Condition交替打印ABC
package com.mock;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
public class TestPrintABC {
private int threadNum = 1;
private Lock lock = new ReentrantLock();
private Condition condition1 = lock.newCondition();
private Condition condition2 = lock.newCondition();
private Condition condition3 = lock.newCondition();
public static void main(String[] args) {
TestPrintABC t = new TestPrintABC();
new Thread(() -> {
for (int i = 0; i < 10; i++) {
t.printA();
}
}).start();
new Thread(() -> {
for (int i = 0; i < 10; i++) {
t.printB();
}
}).start();
new Thread(() -> {
for (int i = 0; i < 10; i++) {
t.printC();
}
}).start();
}
public void printA() {
lock.lock();
try {
if (threadNum != 1) {
try {
condition1.await();
} catch (InterruptedException e) {
}
}
System.out.println("A");
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
threadNum = 2;
condition2.signal();
} finally {
lock.unlock();
}
}
public void printB() {
lock.lock();
try {
if (threadNum != 2) {
try {
condition2.await();
} catch (InterruptedException e) {
}
}
System.out.println("B");
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
threadNum = 3;
condition3.signal();
} finally {
lock.unlock();
}
}
public void printC() {
lock.lock();
try {
if (threadNum != 3) {
try {
condition3.await();
} catch (InterruptedException e) {
}
}
System.out.println("C");
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
threadNum = 1;
condition1.signal();
} finally {
lock.unlock();
}
}
}