concatenate two arrays in java
import java.util.Arrays; public class Concat { public static void main(String[] args) { int[] array1 = {1, 2, 3}; int[] array2 = {4, 5, 6}; int aLen = array1.length; int bLen = array2.length; int[] result = new int[aLen + bLen]; System.arraycopy(array1, 0, result, 0, aLen); System.arraycopy(array2, 0, result, aLen, bLen); System.out.println(Arrays.toString(result)); } }
Merge sort java
public class JavaMergeSort { void sorting(int[] num, int left, int main, int right) { // finding size of two sub arrays int list1 = main - left + 1; int list2 = right - main; // creating temporary array int[] L = new int[list1]; int[] R = new int[list2]; // copying data to temporary array for(int a = 0; a < list1; ++a) L[a] = num[left + a]; for(int b = 0; b < list2; ++b) R[b] = num[main + 1+ b]; // existing index of first and second sub array int p = 0, q = 0; // existing index of merged sub array int r = left; while(p < list1 && q < list2) { if(L[p] <= R[q]) { num[r] = L[p]; p++; } else { num[r] = R[q]; q++; } r++; } // copying remaining elements of L[] array while(p < list1) { num[r] = L[p]; p++; r++; } // copying remaining elements of R[] array while(q < list2) { num[r] = R[q]; q++; r++; } } // function that sorts void sort(int[] arrNum, int l, int r) { if(l < r) { // finding middle point int m = (l + r) / 2; // sorting first and second list sort(arrNum, l, m); sort(arrNum , m+1, r); // merging sorted list sorting(arrNum, l, m, r); } } // display array static void displayArray(int[] arr) { int number = arr.length; for(int a = 0; a < number; ++a) System.out.print(arr[a] + " "); System.out.println(); } public static void main(String[] args) { int[] arrNumbers = {33, 00, 55, 11, 22, 44}; System.out.println("Before sorting - "); displayArray(arrNumbers); JavaMergeSort obj = new JavaMergeSort(); obj.sort(arrNumbers, 0, arrNumbers.length - 1); System.out.println("\nAfter sorting - "); displayArray(arrNumbers); } }
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