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ArrayManipulation.java

@@ -1,22 +1,48 @@
-import java.util.Arrays;
-
-public class ArrayManipulation {
-
-   
-    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 void main(String[] args) {
-       
-        int[] arr = {1,2,3,4,5};
-        System.out.println(Arrays.toString(reverseArray(arr)));
-        
-    }
-}
+import java.util.Arrays;
+
+public class ArrayManipulation {
+
+   
+    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[] help = new int[arr.length - 1];
+      for(int i=1; i < arr.length; i++){        //nico.schroeder@informatik.hs-fulda.de
+           help[i-1] = arr[i];
+
+        }
+        return  help;
+    }  
+        
+
+    public static int[] removeLast(int[] arr){
+        int[] help = new int[arr.length-1];
+        for(int i=0; i<arr.length-1; i++){
+            help[i]=arr[i];
+        }
+        return help;
+    }
+     public static int[] squareEach(int[] arr){
+        int[] square= new int[arr.length];
+        for(int i= 0; i<arr.length; i++){
+            square[i] = arr[i]*arr[i];
+        }
+        return square;
+    } 
+    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(squareEach(arr)));
+        System.out.println(Arrays.toString(removeFirst(arr)));
+        System.out.println(Arrays.toString(removeLast(arr)));
+    }
+}