线程系列5--java中的ThreadLocal类实现线程范围内的数据共享（二）

/**
     * ThreadLocal 类似于map集合 只是集合的key是当前正在运行的线程  
     * 通过ThreadLocal可以将变量（或者是变量的容器）与当前线程相绑定.
     */
    private static ThreadLocal<Integer> threadLocal = new ThreadLocal<Integer>() ;
    public static void main(String[] args) {
    	for(int i = 0 ;i<2 ;i++){
    		new Thread(new Runnable(){
	            @Override
	            public  void run() {
	            	int data = new Random().nextInt();
	            	threadLocal.set(data) ; //将数据绑定到带当前线程
	            	System.out.println(Thread.currentThread().getName()+ " put random data:"+data);
		        	new A().get() ;
		        	new B().get() ;
		        }
		        
		    }).start() ;
    	}
	}
	static class A {
	    public void get(){
	        //取数据都从当前线程中取得 
	    int d = threadLocal.get() ;
	    System.out.println("A from " + Thread.currentThread().getName() 
	            + " get data :" + d);
	    }
	}
	static class B{
	    public void get(){
	        //取数据都从当前线程中取得 
	    int d = threadLocal.get() ;
	    System.out.println("B from " + Thread.currentThread().getName() 
	            + " get data :" + d);
	    }
	}

private static ThreadLocal<MyThreadLocal> threadLocal = new ThreadLocal<MyThreadLocal>();
    public static void main(String[] args) {
    	for(int i = 0 ;i<2 ;i++){
    		new Thread(new Runnable(){
	            @Override
	            public  void run() {
	            	int data = new Random().nextInt();
	            	MyThreadLocal.getMyThreadLocalInstant().setName("傲视苍穹--大泼猴-孙悟空"+data);
	            	MyThreadLocal.getMyThreadLocalInstant().setValue("傲视苍穹--大泼猴-杨婵"+data);
	            	System.out.println(Thread.currentThread().getName()+ " put random data:"+data);
		        	new A().get() ;
		        	new B().get() ;
		        }
		        
		    }).start() ;
    	}
	}
	static class A {
	    public void get(){
	    //取数据都从当前线程中取得 
	    MyThreadLocal myThreadLocal = MyThreadLocal.getMyThreadLocalInstant();
	    System.out.println("A from " + Thread.currentThread().getName() 
	            + " name :" + myThreadLocal.getName()+"value:"+myThreadLocal.getValue());
	    }
	}
	static class B{
	    public void get(){
	    //取数据都从当前线程中取得 
	    MyThreadLocal myThreadLocal = MyThreadLocal.getMyThreadLocalInstant();
	    System.out.println("B from " + Thread.currentThread().getName() 
	            + " name :" + myThreadLocal.getName()+"value:"+myThreadLocal.getValue());
	    }
	}
	static class MyThreadLocal{
		private MyThreadLocal(){}
		//单例模式：线程安全
//		private static MyThreadLocal myThreadLocal = null;
//		public static synchronized MyThreadLocal getMyThreadLocalInstant(){
//			if(myThreadLocal == null){
//				myThreadLocal = new MyThreadLocal();
//			}
//			return myThreadLocal;
//		}
		//使用单例模式的思想，来实现对象创建的思想
		private static ThreadLocal<MyThreadLocal> map = new ThreadLocal<>();
		
		public static MyThreadLocal getMyThreadLocalInstant(){
			if(map.get() == null){
				map.set(new MyThreadLocal());
			}
			return map.get();
		}
		public String getName() {
			return name;
		}
		public void setName(String name) {
			this.name = name;
		}
		public String getValue() {
			return value;
		}
		public void setValue(String value) {
			this.value = value;
		}
		private String name;
		private String value;
	}