20_1.Condition

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

public class Res {
    public String userSex;
    public String userName;
    public boolean flag = false;
    Lock lock = new ReentrantLock();
}

import java.util.concurrent.locks.Condition;

public class IntTread extends Thread{
    private Res res;
    Condition condition;

    public IntTread(Res res, Condition condition) {
        this.res = res;
        this.condition = condition;
    }

    @Override
    public void run() {
        int count = 0;
        while (true){
            try {
                res.lock.lock();
                if (res.flag){
                    try {
                        condition.await();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
                if (count==0){
                    res.userName = "男zs";
                    res.userSex = "男";
                }else {
                    res.userName = "女xh";
                    res.userSex = "女";
                }
                count = (count + 1)%2;
                res.flag = true;
                condition.signal();
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                res.lock.unlock();
            }
        }
    }
}

import java.util.concurrent.locks.Condition;

public class OutThread extends Thread {
    private Res res;
    private Condition condition;

    public OutThread(Res res, Condition condition) {
        this.res = res;
        this.condition = condition;
    }

    @Override
    public void run() {
        while (true){
            try {
                res.lock.lock();
                if (!res.flag){
                    try {
                        condition.await();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
                System.out.println(res.userName + "--" + res.userSex);
                res.flag = false;
                condition.signal();
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                res.lock.unlock();
            }
        }
    }
}

import java.util.concurrent.locks.Condition;

/**
 *  Condition的功能类似于在传统的线程技术中的,Object.wait()和Object.notify()的功能
 *  condition                                    await()        signal()
 */
public class Main {
    public static void main(String[] args){
        Res res = new Res();
        Condition condition = res.lock.newCondition();
        IntTread intTread = new IntTread(res,condition);
        OutThread outThread = new OutThread(res,condition);
        intTread.start();
        outThread.start();
    }
}

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

/**
 * 与重入锁相关联的Condition
 * 和Object.wait(),notify()方法一样，当 线程使用Condition.await()时，要求线程持有相关的重入锁，
 * 在Condition.await()调用后，这个线程会释放这把锁。同理，在condition.signal()方法调用时，也要求
 * 线程先获得相关的锁，在condition.signal()方法调用后，系统会从当前Condition对象的等待队列中唤醒一个线程，
 * 一旦线程被唤醒，它会重新尝试获得与之绑定的重入锁，一旦成功获取，就可以继续执行了。因此，在signal()方法调用之后，
 * 一般需要释放相关的锁，让给被唤醒的线程，让它继续执行。
 */
public class ConditionDemo implements Runnable{
    public static ReentrantLock lock = new ReentrantLock();
    public static Condition condition = lock.newCondition();
    @Override
    public void run() {
        try {
            lock.lock();
            condition.await();//使当前线程等待，同时释放当前锁
            System.out.println("Thread is going on");
        } catch (InterruptedException e) {
            e.printStackTrace();
        }finally {
            lock.unlock();
        }
    }
    public static void main(String[] args) throws InterruptedException{
        ConditionDemo t = new ConditionDemo();
        Thread t1 = new Thread(t);
        t1.start();
        Thread.sleep(2000);
        //通知线程t1继续执行
        lock.lock();//调用signal()的方法时，线程要先获得相关的锁
        condition.signal();//唤醒一个在等待中的线程
        lock.unlock();//signal()调用后释放相关的锁给被唤醒的线程
    }
}

转载于:https://www.cnblogs.com/fly-book/p/11446345.html