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);
}
}Copyright © 2021 Codeinu
Forgot your account's password or having trouble logging into your Account? Don't worry, we'll help you to get back your account. Enter your email address and we'll send you a recovery link to reset your password. If you are experiencing problems resetting your password contact us
