class A{
   private static String c;

   public A(String c1){
           this.c =c1;
                }

   public static String getparam(){
           return c;
             }
}

class B{
   
   A a = new A(c1);
}

class A{
   private String c;

   public A(String c1){
     this.c = c1;}

   public void createThread(){
        new D().start();}

   public void notifyThread(){
     notifyAll();//唤醒线程  
     }
 

}

class D extends Thread{

     public void run(){

           while(true){
              wait();
              if(...)//判断条件里含方法，取A中的变量c;如果满足则继续
         
                {    }else{continue;}//否则返回while去wait();

                                  
   }
 }
}

class B{      
	A a = new A(c1);
}

class A{
	private String c;
	public A(String c1){
		this.c = c1;
	}

	public void createThread(){
		new D(this).start();
	}
	
	public void notifyThread(){
		notifyAll();//唤醒线程       
	}

	public synchronized void setC(string value){
		c = value;
	}

	public synchronized string getC()
	{
		return c;
	}
}
	
class D extends Thread{
	private A _a;
	public D(A a){
		_a = a;
	}

	public void run(){
		while(true){
			wait();
			if(...)//判断条件里含方法，取A中的变量c;如果满足则继续
				{    }
			else{continue;}//否则返回while去wait();
		}
		//访问A的数据
		_a.setC(string c);
	}
}

class B{      
   A a = new A(c1);

   if(...){
        a.createThread();
   }else if(...){
        a.notifyThread();}

}

class A{   
    private String c;  
 
    public A(String c1){     
              this.c = c1;}   

    public void createThread(){        
              new D().start();}   

    public void notifyThread(){     
              notifyAll();//唤醒线程       } 
}

    class D extends Thread{    
 
          public void run(){           
                while(true){              
                   wait();              
                   if(...)//判断条件里含方法，取A中的变量c，满足则继续
                {    }else{continue;} //否则返回while去wait();      

                     } }}