多线程对同一数据进行不同操作

来源：互联网发布：linux网络管理命令编辑：程序博客网时间：2024/06/06 04:22

示例一：网上多数采用的方法，设计得很巧妙

import java.util.concurrent.atomic.AtomicInteger;public class AddSub {AtomicInteger at = new AtomicInteger(1);int j = 1;public static void main(String[] args) {AddSub ab = new AddSub();Add a = ab.new Add();Sub b = ab.new Sub();Thread t1 = new Thread(a);Thread t2 = new Thread(a);Thread t3 = new Thread(b);Thread t4 = new Thread(b);t1.start();t2.start();t3.start();t4.start();}public synchronized void add(){j++;System.out.println("add:"+j);}public synchronized void sub(){j--;System.out.println("sub:"+j);}class Add implements Runnable{@Overridepublic void run() {for(int i=0;i<20;i++){add();}}}class Sub implements Runnable{@Overridepublic void run() {for(int i=0;i<20;i++){sub();}}}}

示例二：采用将数据封装到一个类中进行处理

public class AddSub1 {int j = 10;public static void main(String[] args) {final Sub s = new Sub();for(int i=0;i<2;i++){new Thread(new Runnable() {@Overridepublic void run() {s.add();}}).start();new Thread(new Runnable() {@Overridepublic void run() {s.sub();}}).start();}}}class Sub{int j = 10;public synchronized void add(){j++;System.out.println("add:"+j);}public synchronized void sub(){j--;System.out.println("sub:"+j);}}

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