JUC Lock Condition实现精确通知唤醒

package juc;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class PC {
    public static void main(String[] args) {
        Resource resource = new Resource();
        new Thread(() -> {
            for (int i = 0; i < 10; i++) {
                resource.printA();
            }
        }, "A").start();
        new Thread(() -> {
            for (int i = 0; i < 10; i++) {
                resource.printB();
            }
        }, "B").start();
        new Thread(() -> {
            for (int i = 0; i < 10; i++) {
                resource.printC();
            }
        }, "C").start();
    }
}

class Resource {
    private int number = 1;
    Lock lock = new ReentrantLock();
    private Condition condition1 = lock.newCondition();
    private Condition condition2 = lock.newCondition();
    private Condition condition3 = lock.newCondition();

    /*
    * 1.判断
    * 2.业务
    * 3.通知
    * */
    public void printA() {
        lock.lock();
        try {
            while (number != 1) {
                condition1.await();
            }
            number = 2;
            System.out.println("当前线程的名字"+Thread.currentThread().getName());
            condition2.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }

    public void printB() {
        lock.lock();
        try {
            while (number != 2) {
                condition2.await();
            }
            number = 3;
            System.out.println("当前线程的名字"+Thread.currentThread().getName());
            condition3.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }

    public void printC() {
        lock.lock();
        try {
            while (number != 3) {
                condition3.await();
            }
            number = 1;
            System.out.println("当前线程的名字"+Thread.currentThread().getName());
            condition1.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
}

当前线程的名字A
当前线程的名字B
当前线程的名字C
当前线程的名字A
当前线程的名字B
当前线程的名字C
当前线程的名字A
当前线程的名字B
当前线程的名字C
当前线程的名字A
当前线程的名字B
当前线程的名字C
当前线程的名字A
当前线程的名字B
当前线程的名字C
当前线程的名字A
当前线程的名字B
当前线程的名字C
当前线程的名字A
当前线程的名字B
当前线程的名字C
当前线程的名字A
当前线程的名字B
当前线程的名字C
当前线程的名字A
当前线程的名字B
当前线程的名字C
当前线程的名字A
当前线程的名字B
当前线程的名字C