对list的线程不安全操作

对一个线程不安全的集合进行多线程操作, 并不会破单个元素的完整性, 根据java内存模型可知,

public class TestCl {

	List<Integer> no = Collections.synchronizedList(new ArrayList<>());
	//List<Integer> no = new ArrayList<>();
	public static void main(String[] args) throws InterruptedException {
		TestCl t = new TestCl();
		for(int i=0;i<10000;i++) {
			new Thread(t.new InnerThread(i)).start();
		}
		
		TimeUnit.SECONDS.sleep(10);
		System.out.println(t.no.size());
	}
	
	public  class InnerThread implements Runnable{

		Integer i;
		public InnerThread (Integer i) {
			this.i = i;
		}
		@Override
		public void run() {
			// TODO Auto-generated method stub
			no.add(i);
		}
		
	}
}

public class TestCl {

	//List<Integer> no = Collections.synchronizedList(new ArrayList<>());
	List<Integer> no = new ArrayList<>();
	public static void main(String[] args) throws InterruptedException {
		TestCl t = new TestCl();
		for(int i=0;i<10000;i++) {
			new Thread(t.new InnerThread(i)).start();
		}
		
		TimeUnit.SECONDS.sleep(10);
		System.out.println(t.no.size());
	}
	
	public  class InnerThread implements Runnable{

		Integer i;
		public InnerThread (Integer i) {
			this.i = i;
		}
		@Override
		public void run() {
			// TODO Auto-generated method stub
			no.add(i);
		}
		
	}
}

public boolean add(E e) {
        ensureCapacityInternal(size + 1);  // Increments modCount!!
        elementData[size++] = e;
        return true;
    }

最后

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