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package bonusquiz; |
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import java.util.Arrays; |
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public class ArrayManipulation { |
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public static int[] reverseArray(int[] arr) { |
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for (int i = 0; i < arr.length/2; i++) { |
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int tmp = arr[i]; |
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arr[i] = arr[arr.length - 1 - i]; |
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arr[arr.length - 1 - i] = tmp; |
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} |
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return arr; |
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} |
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/*Liefert ein neues Array zurück ohne das erste Element*/ |
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public static int[] removeFirst(int[] arr) { |
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int [] arrNeu = {}; |
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if(arr.length != 0) { |
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arrNeu = new int[arr.length-1]; |
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for (int i = 1; i < arr.length; i++) { |
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arrNeu[i-1] = arr[i]; |
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} |
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} |
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return arrNeu; |
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} |
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/*Erstellt ein neues Array ohne das letzte Element*/ |
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public static int[] removeLast(int[] arr) { |
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int [] arrNeu = {}; |
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arrNeu = new int[arr.length-1]; |
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if(arr.length != 0) { |
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for (int i =0; i < arr.length -1; i++) { |
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arrNeu[i] = arr[i]; |
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} |
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} |
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return arrNeu; |
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} |
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/*Erstellt ein neues Array wo alle Zahlen quadriert werden*/ |
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public static int[] squareEach(int[] arr) { |
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int [] arrNeu = {}; |
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arrNeu = new int[arr.length]; |
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for (int i=0; i <arr.length; i++) { |
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arrNeu[i] = arr[i] * arr[i]; |
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} |
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return arrNeu; |
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} |
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public static void main(String[] args) { |
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int[] arr = {1,2,3,4,5}; |
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int [] arr2 = {}; |
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System.out.println(Arrays.toString(reverseArray(arr))); |
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System.out.println(Arrays.toString(removeFirst(arr))); |
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System.out.println(Arrays.toString(removeLast(arr))); |
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System.out.println(Arrays.toString(squareEach(arr))); |
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} |
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} |