数组元素交换

public class swapDemo {
    /*
    已知一个数组为：arr={11,22,33,44,55,66}
    将数组中的元素进行交换为：arr={66,55,44,33,22,11}
     */
    public static void main(String[] args) {
     int [] arr={11,22,33,44,55,66};
        reverseArray2(arr);

        for (int i = 0; i < arr.length; i++) {
            System.out.println(arr[i]);
        }
    }

    private static void reverseArray2(int[] arr) {
        for(int start = 0, end = arr.length-1; start<end; start++,end--){
            int temp= arr[start];
            arr[start]= arr[end];
            arr[end]=temp;
        }
    }

    private static void reverseArray1(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;
        }
    }

}