synchronized 锁和Lock锁不同版本的生产者和消费者，以及Lock锁指定线程运行

synchronized 版本

package com.luoKing.PC;
 
 
//synchronized版消费者和生产者
public class A {
    public static void main(String[] args) {
        Data data = new Data();
        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();
        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                try {
                    data.increment();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"C").start();
        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                try {
                    data.decrement();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"D").start();
 
 
    }
 
}
 
//数据源
class Data{
    private int num = 0;
 
    public synchronized void increment() throws InterruptedException {
        while(num!=0){
            this.wait();
        }
        num++;
        System.out.println(Thread.currentThread().getName()+"->"+num);
        this.notifyAll();
    }
 
    public synchronized void decrement() throws InterruptedException {
        while(num==0){
            this.wait();
        }
        num--;
        System.out.println(Thread.currentThread().getName()+"->"+num);
        this.notifyAll();
    }
}

Lock 版本（指定线程运行）

线程运行顺序A->B->c->D->A

package com.luoKing.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 data2 = new Data2();
 
        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                data2.decrementA();
            }
        },"A").start();
        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                data2.incrementB();
            }
        },"B").start();
        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                data2.decrementC();
            }
        },"C").start();
        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                data2.incrementD();
            }
        },"D").start();
 
    }
 
 
}
 
class Data2{
    private int num = 0;
    Lock lock = new ReentrantLock();
 
    Condition conditionA = lock.newCondition();//condition可以判断休眠还是唤醒
    Condition conditionB = lock.newCondition();//condition可以判断休眠还是唤醒
    Condition conditionC = lock.newCondition();//condition可以判断休眠还是唤醒
    Condition conditionD = lock.newCondition();//condition可以判断休眠还是唤醒
 
    public void decrementA(){
        lock.lock();
        try {
            while(num!=0){
                conditionA.await();//线程等待
            }
            System.out.println(Thread.currentThread().getName()+"->"+num++);
            conditionB.signal();//唤醒指定线程
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
    public void decrementC(){
        lock.lock();
        try {
            while(num!=0){
                conditionC.await();//线程等待
            }
            System.out.println(Thread.currentThread().getName()+"->"+num++);
            conditionD.signal();//唤醒所有线程
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
    public void incrementB(){
        lock.lock();
 
        try {
            while(num!=1){
                conditionB.await();
            }
            System.out.println(Thread.currentThread().getName()+"->"+num--);
            conditionC.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
    public void incrementD(){
        lock.lock();
 
        try {
            while(num!=1){
                conditionD.await();
            }
            System.out.println(Thread.currentThread().getName()+"->"+num--);
            conditionA.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
 
 
}