public static void main(String[] args) { Scanner input = new Scanner(System.in); int n = input.nextInt(); int[] a = new int[n]; for(int i = 0; i < a.length; i++) a[i] = (int)(Math.random() * 100); System.out.println("Before sort:"); //System.
2-1 关键字与保留字 关键字(keyword) 保留字(reserved word) 2-2 标识符(Identifier) 案例 class Test{ public static void main(String[] args) { System.out.println("Hello World!"); } } class _9Hello{ } class Public{ } class publicstatic{ } class PublicStatic{ } class Xi