数组元素反转

数组元素反转:

class hello2 {
    public static void main(string[] args) {
        int[] arr = {11,12,13,14,15};
        reversearray(arr);
        print(arr);
        
    }
    public static void reversearray(int[] arr) {
        for (int i = 0;i < arr.length / 2 ;i++ )
        {
            int temp = arr[i];
            arr[i] = arr[arr.length - 1 - i];
            arr[arr.length - 1 - i] = temp;
        }
    }
    public static void print(int[] arr) {
        for (int i = 0;i < arr.length ;i++ )
        {
            system.out.println(arr[i]);
        }
    }

}

结果: