java 多線程（ReadWriteLock）

標籤：

package com.example;public class App {    public static void main(String[] args) {        Info info = new Info();        ReadInfo ri = new ReadInfo(info);        WriteInfo wi = new WriteInfo(info);                Thread t1 = new Thread(ri,"ri1");        Thread t2 = new Thread(ri,"ri2");        Thread t3 = new Thread(ri,"ri3");        Thread t4 = new Thread(wi,"wi1");        Thread t5 = new Thread(wi,"wi2");                t1.start();        t2.start();        t3.start();        t4.start();        t5.start();        }}

package com.example;import java.util.concurrent.locks.ReadWriteLock;import java.util.concurrent.locks.ReentrantReadWriteLock;public class Info {    private int num;    //ReadWriteLock 可以理解為對synchronized更加精細化的管理    private ReadWriteLock lock;        public Info(){        this.num = 0;        lock = new ReentrantReadWriteLock();    }        public int getNum(){        lock.writeLock().lock();        int output = this.num;        lock.writeLock().unlock();        return output;    }        public void setNum(int input){        lock.readLock().lock();        this.num = input;        lock.readLock().unlock();    }    }

package com.example;public class ReadInfo implements Runnable {        private Info info;        public ReadInfo(Info in){        this.info = in;    }        @Override    public void run() {        for(int i = 0; i < 10; i++){            System.out.println(Thread.currentThread().getName() + "   " + info.getNum());            try {                Thread.sleep(1);            } catch (InterruptedException e) {                e.printStackTrace();            }        }    }}

package com.example;public class WriteInfo implements Runnable {        private Info info;        public WriteInfo(Info in){        this.info = in;    }        @Override    public void run() {        for(int i = 0; i < 10; i++){            info.setNum(i + info.getNum());            System.out.println(Thread.currentThread().getName() + "  setInfo:  " + info.getNum());            try {                Thread.sleep(1);            } catch (InterruptedException e) {                e.printStackTrace();            }        }    }}

 

java 多線程（ReadWriteLock）