/* class Person{   String name;   String sex;   boolean flag = true;   public void setPerson(String name, String sex){  				 this.sex=sex;				 this.name=name;      }}class Input implements Runnable{   int x=0;   Person p;   Input(Person p){      this.p=p;   }   public void run(){       while(true){		   if(x==1){			  p.setPerson("hjz", "man");		   }		   else p.setPerson("哈哈哈", "女女女女");		   x=(x+1)%2;	   }   } }class Output implements Runnable{   int x=0;   Person p;   Output(Person p){      this.p=p;   }   public void run(){       while(true){	       System.out.println(p.name + "....." + p.sex);	   }   } } public class Test{    public static void main(String[] args){	     Person p = new Person();		 new Thread(new Input(p)).start();		 new Thread(new Output(p)).start();	}}*//*输出的结果：哈哈哈.....manhjz.....manhjz.....man哈哈哈.....manhjz.....女女女女*///线程安全隐患出现：首先考虑到是多线程操作了同一资源，所以要用同步！/* class Person{   String name;   String sex;   boolean flag = true;   public void setPerson(String name, String sex){  				 this.sex=sex;				 this.name=name;      }}class Input implements Runnable{   int x=0;   Person p;   Input(Person p){      this.p=p;   }   public void run(){       while(true){	      synchronized(new Object()){			   if(x==1){				  p.setPerson("hjz", "man");			   }			   else p.setPerson("哈哈哈", "女女女女");			   x=(x+1)%2;		  }	   }   } }class Output implements Runnable{   int x=0;   Person p;   Output(Person p){      this.p=p;   }   public void run(){       while(true){	       System.out.println(p.name + "....." + p.sex);	   }   } }public class Test{    public static void main(String[] args){	     Person p = new Person();		 new Thread(new Input(p)).start();		 new Thread(new Output(p)).start();	}} *///同步完成之后，发现还是出现安全隐患的情况，在考虑一下是否访问统一资源的多个线程用的是同一个锁！//本例中的应将输入输出一起同步（注意输入输出不在同一个线程之中,输出线程不会获得 Person p对象的控制权！）/*   class Input implements Runnable{   int x=0;   Person p;      Input(Person p){      this.p=p;   }   public void run(){       while(true){	      synchronized(p){		       if(p.flag){			     try{					 p.wait();				   }catch(InterruptedException e){				   }			   }		       if(!p.flag){				   if(x==1){					  p.setPerson("hjz", "man");				   }				   else p.setPerson("哈哈哈", "女女女女");				   x=(x+1)%2;			   }			   			   p.flag=true;			   p.notify();			   		  }	   }   } } *///现在的代码是将同步放到函数里！真正开发过的时候就是这样实现，也就是我们多个线程同事操作一个类对象//调用该类提供的对外方法，并将调用的方法进行同步！防止安全隐患！class Person{   String name;   String sex;   boolean flag = true;   public void setPerson(String name, String sex){       synchronized(this){	     if(!flag){		     try{			    wait();			 }catch(InterruptedException e){}		 }	     if(flag){				 this.sex=sex;				 try{					Thread.sleep(100);				 }catch(InterruptedException e){}				 this.name=name;	     }		 flag=false;		 notify();	   }   }      public void outPerson(){      synchronized(this){	      if(flag){		     try{			     wait();			 }catch(InterruptedException e){}		  }		  if(!flag){		      System.out.println(name + "....." + sex);		  }		  flag=true;		  notify();	  }   }}class Input implements Runnable{   int x=0;   Person p;      Input(Person p){      this.p=p;   }   public void run(){       while(true){				   if(x==1){					  p.setPerson("hjz", "man");				   }				   else p.setPerson("哈哈哈", "女女女女");				   x=(x+1)%2;	   }   } }class Output implements Runnable{   int x=0;   Person p;   Output(Person p){      this.p=p;   }   public void run(){       while(true){	       p.outPerson();	   }   } }  public class Test{    public static void main(String[] args){	     Person p = new Person();		 new Thread(new Input(p)).start();		 new Thread(new Output(p)).start();	}}