lock与synchronized的区别 

  1 import com.sun.org.apache.bcel.internal.generic.NEW;
  2 
  3 import java.util.concurrent.locks.Condition;
  4 import java.util.concurrent.locks.Lock;
  5 import java.util.concurrent.locks.ReentrantLock;
  6 
  7 /**
  8  * //AA 5  BB 10 CC 15
  9  * 来10轮
 10  */
 11 public class SyncAndReentrantLockDemo {
 12 
 13     public static void main(String[] args) {
 14         ShareResource shareResource=new ShareResource();
 15 
 16             new Thread(()->{
 17                 for (int i = 0; i <10 ; i++) {
 18                     shareResource.printAA();
 19                 }
 20             },"AA").start();
 21 
 22             new Thread(()->{
 23                 for (int i = 0; i <10 ; i++) {
 24                     shareResource.printBB();
 25                 }
 26 
 27             },"BB").start();
 28 
 29         new Thread(()->{
 30             for (int i = 0; i <10 ; i++) {
 31                 shareResource.printCC();
 32             }
 33 
 34         },"CC").start();
 35 
 36     }
 37 
 38 }
 39 class ShareResource{
 40     private int number =1;
 41     Lock lock=new ReentrantLock();
 42     Condition conditionA=lock.newCondition();
 43     Condition conditionB=lock.newCondition();
 44     Condition conditionC=lock.newCondition();
 45     public void printAA(){
 46         lock.lock();
 47         try{
 48             while(number!=1){
 49                 try {
 50                     conditionA.await();
 51                 }catch (Exception e){
 52 
 53                 }
 54             }
 55             for (int i = 0; i <5 ; i++) {
 56                 System.out.println(Thread.currentThread().getName()+"\t   打印AA"+i);
 57             }
 58             number=2;
 59             conditionB.signal();
 60         }catch (Exception e){
 61 
 62         }finally {
 63             lock.unlock();
 64         }
 65     }
 66     public void printBB(){
 67         lock.lock();
 68         try{
 69             while(number!=2){
 70                 try {
 71                     conditionB.await();
 72                 }catch (Exception e){
 73 
 74                 }
 75             }
 76             for (int i = 0; i <10 ; i++) {
 77                 System.out.println(Thread.currentThread().getName()+"\t   打印BB"+i);
 78             }
 79             number=3;
 80             conditionC.signal();
 81         }catch (Exception e){
 82 
 83         }finally {
 84             lock.unlock();
 85         }
 86 
 87     }
 88     public void printCC(){
 89         lock.lock();
 90         try{
 91             while(number!=3){
 92                 try {
 93                     conditionC.await();
 94                 }catch (Exception e){
 95 
 96                 }
 97             }
 98             for (int i = 0; i <15 ; i++) {
 99                 System.out.println(Thread.currentThread().getName()+"\t   打印CC"+i);
100             }
101             number=1;
102             conditionA.signal();
103         }catch (Exception e){
104 
105         }finally {
106             lock.unlock();
107         }
108 
109     }
110 }

 

posted @ 2021-05-09 09:13  ffzzblog  阅读(86)  评论(0)    收藏  举报