Question

1,4,3,2,5,6,7,8,9, , ,22,13这个数列的中间空的填什么

Answer 1

方法不少，最直接的一种：倒叙存放，然后打印输出： public class ReverseArray { public static void main(String[] args) { int arr[] = new int[] { 1,2,3,4,5,6,7,8,9 }; for(int i = 0; i < arr.length / 2; i++){ int temp = arr[i]; arr[i] = arr[arr.length - i - 1]; arr[arr.length - i - 1] = temp; } for (int i = 0; i < arr.length; i++) { //System.out.println(arr[i]); //每个一行 System.out.print(" "+arr[i]); //全部一行 } System.out.println(); }} 结果： 9 8 7 6 5 4 3 2 1

Answer 2

1,4,3,2,5,6,7,8,9,a,b,22,13
1, ,3, ,5, ,7, ,9,a,11, ,13
,4, ,2, ,6, ,8, ,14,b,22,
a=14,b=11
结果：1,4,3,2,5,6,7,8,9,14,11,22,13