Java中数组的反转

public class ArrayDemo2 {
    public static void main(String[] args) {
        //定义一个数组存放元素
        int[] arr3 = {10, 20, 30, 40, 50, 60, 70, 80, 90};
        //arr3.length/2 需要互换的次数
        for (int i = 0; i < arr3.length / 2; i++) {
            //进行数组互换
            int sum = arr3[i];
            arr3[i] = arr3[arr3.length - 1 - i];
            arr3[arr3.length - 1 - i] = sum;
        }
        for (int i = 0; i < arr3.length; i++) {//重新遍历一次数组
            System.out.print(arr3[i] + " ");
        }
    }

}