加了一个random内存占用减少很多，是为什么

[mmqw]

	@Override
	public void run() {
		//ThreadLocalRandom random = ThreadLocalRandom.current();
		while(true)
		{
			try {
				String str = new String("123");
				Thread.sleep(100);
				System.out.println("....." + Thread.currentThread().getName()+" is live");
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
	
	public static void main(String[] args)
	{

		
		for(int i=0;i<4000;i++){
			EmptyTask task = new EmptyTask();
			task.start();
		}
	}

运行起来以后，会短时间内占用差不多1G内存

	@Override
	public void run() {
		ThreadLocalRandom random = ThreadLocalRandom.current();
		while(true)
		{
			try {
				String str = new String("123");
				Thread.sleep(100);
				System.out.println("....." + Thread.currentThread().getName()+" is live");
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
	
	public static void main(String[] args)
	{

		
		for(int i=0;i<4000;i++){
			EmptyTask task = new EmptyTask();
			task.start();
		}
	}

内存占用的峰值就只有400M左右，不明白是什么原因引起的

[mmqw]