public class Demo08 {
    public static void main(String[] args) {
        //定义一个数组
        int[] arr ={1,2,3,4,5};
        for (int i = 0,j=arr.length-1; i < j; i++,j--) {
            int temp=arr[i];
            arr[i]=arr[j];
            arr[j]=temp;
        }
        for (int i = 0; i < arr.length; i++) {
            System.out.println(arr[i]);
        }
    }
}

5 4 3 2 1