first commit

ArrayManipulation.java

@@ -0,0 +1,54 @@
+import java.util.Arrays;
+
+public class ArrayManipulation {
+
+    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)));
+        System.out.println(Arrays.toString(squareEach(arr)));
+    }
+
+    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) {
+        int[] arr1 = new int[arr.length - 1];
+        for (int j = 0; j < arr1.length; j++) {
+            arr1[j] = arr[j + 1];
+
+        }
+
+        return arr1;
+    }
+
+    public static int[] removeLast(int[] arr) {
+        int[] arr1 = new int[arr.length - 1];
+        for (int j = 0; j < arr.length - 1; j++) {
+            arr1[j] = arr[j];
+
+        }
+
+        return arr1;
+    }
+
+    public static int[] squareEach(int[] arr) {
+        int[] arr1 = new int[arr.length];
+        for (int j = 0; j < arr.length; j++) {
+            arr1[j] = arr[j] * arr[j];
+
+        }
+
+        return arr1;
+    }
+}