Java基础之验证静态同步函数锁

迈不过友情╰ 2022-11-28 13:34 114阅读 0赞

/*
    静态的同步函数使用的锁是  该函数所属字节码文件对象 
    可以用 getClass方法获取，也可以用当前  类名.class 表示。
    
    
    */
    
    class Ticket implements Runnable
    {
        
    	private static  int num = 100;
    //	Object obj = new Object();
    	boolean flag = true;
    	public void run()
    	{
        
    //		System.out.println("this:"+this.getClass());
    
    		if(flag)
    			while(true)
    			{
        
    				synchronized(Ticket.class)//(this.getClass())
    				{
        
    					if(num>0)
    					{
        
    						try{
        Thread.sleep(10);}catch (InterruptedException e){
        }						
    						System.out.println(Thread.currentThread().getName()+".....obj...."+num--);
    					}
    				}
    			}
    		else
    			while(true)
    				this.show();
    	}
    
    	public static synchronized void show()
    	{
        
    		if(num>0)
    		{
        
    			try{
        Thread.sleep(10);}catch (InterruptedException e){
        }
    			
    			System.out.println(Thread.currentThread().getName()+".....function...."+num--);
    		}
    	}
    }
    
    class StaticSynFunctionLockDemo 
    {
        
    	public static void main(String[] args) 
    	{
        
    		Ticket t = new Ticket();
    
    //		Class clazz = t.getClass();
    //		
    //		Class clazz = Ticket.class;
    //		System.out.println("t:"+t.getClass());
    
    		Thread t1 = new Thread(t);
    		Thread t2 = new Thread(t);
    
    		t1.start();
    		try{
        Thread.sleep(10);}catch(InterruptedException e){
        }
    		t.flag = false;
    		t2.start();
    	}
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg1MzY2OQ_size_16_color_FFFFFF_t_70_pic_center_pic_center]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg1MzY2OQ_size_16_color_FFFFFF_t_70_pic_center_pic_center]: /images/20221124/9d8346d49e324210b6c382112901a90b.png