java scanner

scanner(System.in)一旦调用close方法关闭之后，无法再调用

	Scanner s1 = new Scanner(System.in);
		Scanner s2 = new Scanner(System.in);
		String msg1 = s1.nextLine();
		System.out.println(msg1);
//	1	
		s1.close();
		String msg2 = s1.nextLine();
		System.out.println(msg2);

当s1关闭之后

调用s2的nextLine方法报错如下

Exception in thread "main" java.lang.IllegalStateException: Scanner closed

说明底层是将传入的System.in这个流关闭了