黑马程序员——多个生产者，多个消费者 signalAll() JDK1.5线程新特性_多生产者多消费者为什么 signalall-优快云博客

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本文介绍Java中使用Lock和Condition实现多线程间的高级通信机制，替代传统的synchronized及Object的wait和notify方法，通过具体示例展示了如何精确控制线程间的唤醒。

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package thread;
import java.util.concurrent.locks.*;
import java.util.concurrent.locks.Lock;
/**
 * JDK1.5以后对多线程间通信的等待唤醒机制进行了升级     新特性
 * 将同步关键字Synchronized替换成显示Lock操作
 * 将Object中的wait(),notify(),notifyAll()替换成了Condition对象
 * 该对象可以对Lock锁进行获取
 * 该实例中，实现了只唤醒对方的操作
 * @author wjw
 *
 */
public class Procedure_Customer_Up{
 public static void main(String[] args) {
  Resource_up res=new Resource_up();
  
  Procedure_up pro=new Procedure_up(res);
  Procedure_up pro1=new Procedure_up(res);
  
  Customer_up cus=new Customer_up(res);
  Customer_up cus1=new Customer_up(res);
 
  new Thread(pro).start();
  new Thread(pro1).start();
  new Thread(cus).start();
  new Thread(cus1).start();
 }
}
class Resource_up{
 private String name;
 private int count=1;
 private boolean boo;
 private Lock lock=new ReentrantLock();//创建锁，一个锁可以对应多个Condition对象
 private Condition condition_pro=lock.newCondition();//锁对应的状态一
 private Condition condition_cus=lock.newCondition();//锁对应的状态二
 public  void setNameCount(String name){
  lock.lock();
  try{
   while(boo){
    try{
     condition_pro.await();
    }catch(Exception e){
     e.printStackTrace();
    }
   }
   this.name=name+",,,"+count++;
   System.out.println("生产者："+this.name);
   boo=true;
   condition_cus.signal();
  }finally{
   lock.unlock();//释放锁的动作一定要执行
  }
 }
 public synchronized void out(){
  lock.lock();
  try{
   while(!boo){
    try{
     condition_cus.await();
    }catch(Exception e){
     e.printStackTrace();
    }
   }
   
   System.out.println("============消费者======"+this.name);
   boo=false;
   condition_pro.signal();
  }finally{
   lock.unlock();
  }
 }
 public String getName() {
  return name;
 }
 public void setName(String name) {
  this.name = name+"..."+count++;
 }
 public int getCount() {
  return count;
 }
 public void setCount(int count) {
  this.count = count;
 }
 public boolean isBoo() {
  return boo;
 }
 public void setBoo(boolean boo) {
  this.boo = boo;
 }
 
}
class Procedure_up implements Runnable{
 private Resource_up res;
 public Procedure_up(Resource_up res){
  this.res=res;
 }
 public void run(){
  while(true){
   res.setNameCount("abc");
  }
 }
}
class Customer_up implements Runnable{
 private Resource_up res;
 public Customer_up(Resource_up res){
  this.res=res;
 }
 public void run(){
  while(true){
   res.out();
  }
 }
}

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