小代码训练

1.输入元素反转：如对int[] arr = {1,10,5,8,7,3,9}; 将其进行逆序排列   ——数组折半，对应位置交换

package cn.test.array;

public class ArrayReverseTest {
    public static void main(String[] args) {
        int[] arr = {1,10,5,8,7,3,9};
        int len = arr.length-1;
        for (int i = 0; i < len/2; i++) {
            int temp = arr[i];
            arr[i] = arr[len-i];
            arr[len-i]=temp;
        }
        for(int i:arr){
            System.out.print (i+" ");
        }
    }
}