demo-ha1/ArrayManipulation.java

import java.util.Arrays;

public class ArrayManipulation {


    public static int[] removeLast(int[] arr) {
        if (arr == null || arr.length < 1) {
            return arr;
        }
        int[] result = new int[arr.length-1];
        for (int i = 0; i < result.length; i++) {
            result[i] = arr[i];
        }
        return result;
    }
   
    public static int[] reverseArray(int[] arr) {

        for (int i = 0; i < arr.length/2; i++) {
            int tmp = arr[i];
            arr[i] = arr[arr.length - 1 - i];
            arr[arr.length - 1 - i] = tmp;
         }
         return arr;
    }

    public static int[] removeFirst(int[] arr) {
        if (arr == null || arr.length < 1) {
            return arr;
        }
        int[] result = new int[arr.length-1];
        for (int i = 0; i < result.length; i++) {
            result[i] = arr[i+1];
        }
        return result;
    }

    public static void main(String[] args) {
       
        int[] arr = {1,2,3,4,5};
        System.out.println(Arrays.toString(reverseArray(arr)));
        System.out.println(Arrays.toString(removeFirst(arr)));        
        System.out.println(Arrays.toString(removeLast(arr)));        
    }
}