反转数组，顺序颠倒

import java.util.Arrays;


public class FanZhuan {
    public static void main(String[] args) {
        //定义数组
        int[] arr = {10,20,30,40,50,60,70};
        //利用Array类中的toString方法输出数组
        System.out.println("反转前:" + Arrays.toString(arr));
        //循环遍历数组,开始索引start，结束索引end
        for (int start=0,end=arr.length-1;start<=end;start++,end--){
            //把start存入临时变量
            int temp = arr[start];
            //把end赋值给start
            arr[start] = arr[end];
            //把start赋值给end
            arr[end] = temp;
        }
        System.out.println("反转后:" + Arrays.toString(arr));
    }
}