Java—读写锁的简单使用_java 读写lock使用

package cn.itcast.heima;
import java.util.Random;
import java.util.concurrent.locks.ReadWriteLock;

import java.util.concurrent.locks.ReentrantReadWriteLock;

public class ReadWriteLockTest {

public static void main(String[] args) {
final Queue3 q3 = new Queue3();
for(int i=0;i<3;i++)
{
new Thread(){
public void run(){
while(true){
q3.get();
}
}

}.start();


new Thread(){
public void run(){
while(true){
q3.put(new Random().nextInt(10000));
}
}

}.start();
}

}
}


class Queue3{
private Object data = null;//共享数据，只能有一个线程能写该数据，但可以有多个线程同时读该数据。
ReadWriteLock rwl = new ReentrantReadWriteLock();
public void get(){
rwl.readLock().lock();
try {
System.out.println(Thread.currentThread().getName() + " be ready to read data!");
Thread.sleep((long)(Math.random()*1000));
System.out.println(Thread.currentThread().getName() + "have read data :" + data);
} catch (InterruptedException e) {
e.printStackTrace();
}finally{
rwl.readLock().unlock();
}
}

public void put(Object data){


rwl.writeLock().lock();
try {
System.out.println(Thread.currentThread().getName() + " be ready to write data!");
Thread.sleep((long)(Math.random()*1000));
this.data = data;
System.out.println(Thread.currentThread().getName() + " have write data: " + data);
} catch (InterruptedException e) {
e.printStackTrace();
}finally{
rwl.writeLock().unlock();
}
}

}

读锁和读锁不互斥，读锁和写锁互斥，写锁和写锁互斥