三个线程交替打印ABC：

package pc;import java.util.concurrent.locks.Condition; import java.util.concurrent.locks.Lock; import java.util.concurrent.locks.ReentrantLock;public class C {public static void main(String[] args) {Data3 data3 = new Data3();new Thread(()->{for (int i = 0; i < 50; i++) {data3.PrintA();}}).start();new Thread(()->{for (int i = 0; i < 50; i++) {data3.PrintB();}}).start();new Thread(()->{for (int i = 0; i < 50; i++) {data3.PrintC();}}).start();} } class Data3{private char chars = 'A';Lock lock = new ReentrantLock();Condition condition1 = lock.newCondition();Condition condition2 = lock.newCondition();Condition condition3 = lock.newCondition();public void PrintA(){lock.lock();try {while (chars != 'A') {//等待condition1.await();}System.out.print(chars);chars = 'B';condition2.signal();} catch (Exception e) {e.printStackTrace();}finally {lock.unlock();}}public void PrintB(){lock.lock();try {while (chars != 'B') {condition2.await();}System.out.print(chars);chars = 'C';condition3.signal();} catch (InterruptedException e) {e.printStackTrace();} finally {lock.unlock();}}public void PrintC() {lock.lock();try {while (chars != 'C') {condition3.await();}System.out.print(chars);chars = 'A';condition1.signal();} catch (InterruptedException e) {e.printStackTrace();} finally {lock.unlock();}} }

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生产者和消费者问题：

（synchronize + wait + notifyAll）

//判断等待，业务，通知 class Data {private int number = 0;public synchronized void increment() throws InterruptedException {while (number != 0) {//等待this.wait();}number++;System.out.println(Thread.currentThread().getName() + "=>" + number);//通知其他线程，我+1完毕了this.notifyAll();}public synchronized void decrement() throws InterruptedException {while (number == 0) {this.wait();}number--;System.out.println(Thread.currentThread().getName() + "=>" + number);//通知其他线程，我-1完毕了this.notifyAll();} }

（ReentrantLock+Condition）

package pc;import java.util.concurrent.locks.Condition; import java.util.concurrent.locks.Lock; import java.util.concurrent.locks.ReentrantLock;public class B {public static void main(String[] args) {Data2 data = new Data2();new Thread(() -> {for (int i = 0; i < 10; i++) {try {data.increment();} catch (InterruptedException e) {e.printStackTrace();}}}, "A").start();new Thread(() -> {for (int i = 0; i < 10; i++) {try {data.decrement();} catch (InterruptedException e) {e.printStackTrace();}}}, "B").start();} }class Data2 {private int number = 0;Lock lock = new ReentrantLock();Condition condition = lock.newCondition();public void increment() throws InterruptedException {lock.lock();try {while (number != 0) {//等待condition.await();}number++;System.out.println(Thread.currentThread().getName() + "=>" + number);//通知其他线程，我+1完毕了condition.signalAll();} catch (Exception e) {e.printStackTrace();} finally {lock.unlock();}}public void decrement() throws InterruptedException {lock.lock();try {while (number == 0) {condition.await();}number--;System.out.println(Thread.currentThread().getName() + "=>" + number);//通知其他线程，我-1完毕了condition.signalAll();} catch (InterruptedException e) {e.printStackTrace();} finally {lock.unlock();}} }

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