Marc Leuschner
3 years ago
1 changed files with 51 additions and 20 deletions
@ -1,31 +1,62 @@ |
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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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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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} |
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public static int[] removeFirst(int[] arr) { |
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if (arr == null || arr.length==0) { |
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int[] result = new int[0]; |
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return result; |
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} |
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if(arr.length == 1||arr.length == 0) { |
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return arr; |
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} |
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int[] result = new int[arr.length-1]; |
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for(int a=1;a<arr.length;a++) { |
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result[a-1] = arr[a]; |
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} |
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return result; |
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} |
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public static int[] removeLast(int[] arr) { |
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if (arr == null || arr.length==0) { |
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int[] result = new int[0]; |
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return result; |
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} |
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if(arr.length == 1||arr.length == 0) { |
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return arr; |
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} |
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int[] result = new int[arr.length-1]; |
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for(int a=0;a<arr.length-1;a++) { |
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result[a] = arr[a]; |
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} |
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return result; |
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} |
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public static int[] squareEach(int[] arr) { |
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if (arr == null || arr.length==0) { |
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int[] result = new int[0]; |
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return result; |
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} |
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int[] result = new int[arr.length]; |
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for(int a=0;a<arr.length;a++) { |
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result[a] = arr[a] * arr[a]; |
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} |
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return result; |
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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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System.out.println(Arrays.toString(reverseArray(arr))); |
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} |
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int[] arr = {6,7,8,9,10}; |
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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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} |
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