Aufrufargumente geändert

src/ArrayManipulation.java

@@ -1,10 +1,7 @@
 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];
@@ -14,18 +11,52 @@ public class ArrayManipulation {
   }
   
   public static int[] removeFirst(int[] arr) {
-	  
+    if (arr == null || arr.length==0) {
+	  int[] result = new int[0];
+	  return result;
+	}
+	if(arr.length == 1||arr.length == 0) {
+	  return arr;	  
+	}
+	int[] result = new int[arr.length-1];
+	for(int a=1;a<arr.length;a++) {
+	  result[a-1] = arr[a];
+	}
+    return result;  
   }
   
+  public static int[] removeLast(int[] arr) {
+    if (arr == null || arr.length==0) {
+      int[] result = new int[0];
+      return result;
+	}		  
+	if(arr.length == 1||arr.length == 0) {
+	  return arr;	  
+	}
+	int[] result = new int[arr.length-1];
+	for(int a=0;a<arr.length-1;a++) {
+	  result[a] = arr[a];
+	}
+	return result;   
+  }
   
-
-  
-  
+  public static int[] squareEach(int[] arr) {
+    if (arr == null || arr.length==0) {
+	  int[] result = new int[0];
+	  return result;
+	}
+	int[] result = new int[arr.length];
+    for(int a=0;a<arr.length;a++) {
+	  result[a] = arr[a] * arr[a];
+	}
+	return result;     
+  }
     
   public static void main(String[] args) {   
-       
-        int[] arr = {1,2,3,4,5};
+    int[] arr = {6,7,8,9,10};
     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)));
   }
 }