關鍵代碼1

private Lock lock = new ReentrantLock();

private Condition condition_pro = lock.newCondition();

private Condition condition_con = lock.newCondition();

關鍵代碼2

r.getLock().lock();

try{r.getCondition_pro().await();}catch(Exception e){}

r.getCondition_con().signalAll();
                
r.getLock().unlock();                 、
 

完整代碼：

package songyan;
import java.util.concurrent.locks.*;
 class Res{
     private Lock lock = new ReentrantLock();

     public Lock getLock() {
        return lock;
    }
    public void setLock(Lock lock) {
        this.lock = lock;
    }
    private Condition condition_pro = lock.newCondition();
     
 
public Condition getCondition_pro() {
        return condition_pro;
    }
    public void setCondition_pro(Condition condition_pro) {
        this.condition_pro = condition_pro;
    }
    public Condition getCondition_con() {
        return condition_con;
    }
    public void setCondition_con(Condition condition_con) {
        
 
this.condition_con = condition_con;
    }
    private Condition condition_con = lock.newCondition();
     
     private String name;
     private int id;
     private boolean flag;
     public boolean getFlag()
     {
         return flag;
     }
     public void setFlag(boolean flag)
     {
         this.flag=flag;
     }
     public String getName()
     {
         return name;
     }
     public int getId()
     {
         return id;
     }
     public void setName(String name)
     {
         this.name=name;
     }
     public void setId(int id)
     {
         this.id=id;
     }
 }
 class Pro implements Runnable{
     private Res r;
     public void run() 
     {
         int x=0;
         while(true)
         {
             r.getLock().lock();
                 while(r.getFlag())
                     try{r.getCondition_pro().await();}catch(Exception e){}
                 if(x==0)
                 {
                     r.setName("張三");
                     r.setId(r.getId()+1);
                     System.out.println(r.getName()+"**生產*****"+r.getId());
                 }
                 else{
                     r.setName("zhangsan");
                     r.setId(r.getId()+1);
                     System.out.println(r.getName()+"**生產*****"+r.getId());
                 }
                 x=(x+1)%2;
                 r.setFlag(true);
                 r.getCondition_con().signalAll();
                 r.getLock().unlock();
         }
     }
     Pro(Res r)
     {
         this.r=r;
     }
 }
 class Cons implements Runnable{
     private Res r;
     public void run()
     {
         while(true)
         {
                r.getLock().lock();
                while(!r.getFlag())
                    try{r.getCondition_con().await();}catch(Exception e){}
                
                System.out.println(r.getName()+"***消費者****"+r.getId());
                
                r.setFlag(false);
                r.getCondition_pro().signalAll();
                r.getLock().unlock();
         }
     }
     Cons(Res r)
     {
         this.r=r;
     }
 }
 public class test{
     public static void main(String[] args) {
         Res r= new Res();
         
         Pro p= new Pro(r);
         Cons c= new Cons(r);
         
         Thread t1= new Thread(p);
         Thread t2= new Thread(c);
         Thread t3= new Thread(p);
         Thread t4= new Thread(c);
         
         t1.start();
         t2.start();
         t4.start();
         t3.start();
         
    }
    
 }

13，多線程-生產者消費者問題2