"读写" 、"写读"、"写写"都是同步的、互斥的 

 

1、Service.java

package ReentrantReadWriteLock;import java.util.concurrent.locks.ReentrantReadWriteLock;public class Service {    private ReentrantReadWriteLock lock = new ReentrantReadWriteLock();        //写写互斥    public void write(){                try{            try{                lock.writeLock().lock();//写锁                System.out.println("获得写锁"+Thread.currentThread().getName()+" "+System.currentTimeMillis());                Thread.sleep(10000);            }finally{                lock.writeLock().unlock();//解锁            }                    }catch(Exception e){            e.printStackTrace();        }            }        }

可以发现，lock.writeLock()的效果就是同一时间只允许一个线程执行lock()方法后面的代码

 

2、ThreadA.java

package ReentrantReadWriteLock;public class ThreadA extends Thread{    private Service service ;        public ThreadA(Service service){        super();        this.service = service;    }        @Override    public void run(){        service.write();    }        }

 

 

3、ThreadB.java

package ReentrantReadWriteLock;public class ThreadB extends Thread{private Service service ;        public ThreadB(Service service){        super();        this.service = service;    }        @Override    public void run(){        service.write();    }        }

 

 

4、Run.java

package ReentrantReadWriteLock;public class Run {    public static void main(String[] args) {                Service service = new Service();        ThreadA a = new ThreadA(service);        a.setName("A");        ThreadB b = new ThreadB(service);        b.setName("B");        a.start();        b.start();    }}

 

可以自己更改ThreadA和ThreadB类中的run()方法里的read()、write()方法，实验"读写"、"写读"、"写写"