Notes

import java.util.Random;
import java.util.Arrays;

public class ArrayMeld {
public static int[] meld(int[] a, int[] b){
// Declaring Varialbes
int i = 0,j = 0,k= 0,a_size = a.length , b_size = b.length; //a.length returns the length of the array
int[] sorted_arr = new int[a.length + b.length]; // Declaring a new array with size of a.lenght + b.length
while(i<a_size && j<b_size){ // Iterating until one of the array gets completed.
if(a[i] < b[j]){ // comparing to get smaller element of two arrays.
sorted_arr[k++] = a[i++]; // assigning smaller element to sorted_arr
}
else{
sorted_arr[k++] = b[j++];
}
}
if (i<a_size){ //If still have elements in 'a'
System.arraycopy(a,i,sorted_arr,k,a_size-i); // elements of 'a' from index 'i' up to end
} //are copied into sorted_arr from index 'k'
if (j<b_size){ //If still have elements in 'b'
System.arraycopy(b,j,sorted_arr,k,b_size-j); // Same as above.
}
return sorted_arr; // returning sorted array.
}
// Given functions
public static int[] nextArray(int maxLength){
Random r = new Random();
int length = r.nextInt(maxLength + 1);
return new int[length];
}
public static void populateArray(int[] array, int maxValue){
Random r = new Random();
for (int i = 0;i < array.length; i++){
array[i] = r.nextInt(maxValue +1);
}
}
public static void main(String[] args) {
int[] arr1 = nextArray(7);
int[] arr2 = nextArray(7);

populateArray(arr1,9);
populateArray(arr2,9);

Arrays.sort(arr1);
Arrays.sort(arr2);

System.out.print("arr1 is ");
System.out.println(Arrays.toString(arr1));
System.out.print("arr2 is ");
System.out.println(Arrays.toString(arr2));

int[] arr3 = meld(arr1,arr2);

System.out.print("arr3 is ");
System.out.println(Arrays.toString(arr3));
}
}