经典的多线程的题目

 

class Info{
 private String name = "AAA";
 private String content = "BBB" ;
 private boolean flag = false ;
 public synchronized void set(String name,String content){
  if(!flag){
   try{
    super.wait() ;
   }catch(InterruptedException e){
    e.printStackTrace() ;
   }
  }
  this.setName(name) ;
  try{
   Thread.sleep(100) ;
  }catch(InterruptedException e){
   e.printStackTrace() ;
  }
  this.setContent(content) ;
  flag = false ;
  super.notify() ;
 }
 public synchronized void get(){
  if(flag){
   try{
    super.wait() ;
   }catch(InterruptedException e){
    e.printStackTrace() ;
   }
  }
  try{
   Thread.sleep(300) ;
  }catch(InterruptedException e){
   e.printStackTrace() ;
  }
  System.out.println(this.getName() +
   " --> " + this.getContent()) ;
  flag = true ;
  super.notify() ;
 }
 public void setName(String name){
  this.name = name ;
 }
 public void setContent(String content){
  this.content = content ;
 }
 public String getName(){
  return this.name ;
 }
 public String getContent(){
  return this.content ;
 }
};
class Producer implements Runnable{
 private Info info = null ;
 public Producer(Info info){
  this.info = info ;
 }
 public void run(){
  boolean flag = false ;
  for(int i=0;i<50;i++){
   if(flag){
    this.info.set("A","A") ;
    flag = false ;
   }else{
    this.info.set("B","B") ;
    flag = true ;
   }
  }
 }
};
class Consumer implements Runnable{
 private Info info = null ;
 public Consumer(Info info){
  this.info = info ;
 }
 public void run(){
  for(int i=0;i<50;i++){
   this.info.get() ;
  }
 }
};
public class ThreadDe{
 public static void main(String args[]){
  Info info = new Info();
  Producer pro = new Producer(info) ;
  Consumer con = new Consumer(info) ;
  new Thread(pro).start() ;
     new Thread(con).start() ;
 }
};