Java program to merge two sorted arrays

import java.util.*;
public class Main{
	public static void main(String[] args) {
	    int n1,n2,i,m=0,n=0,k=0;
	    Scanner sc=new Scanner(System.in);
	    n1=sc.nextInt();
	     n2=sc.nextInt();
	    int[] a1=new int[n1];
	    int[] a2=new int[n2];
	    int[] a3=new int[n1+n2];
	    for(i=0;i<n1;i++)
	    a1[i]=sc.nextInt();
	    for(i=0;i<n1;i++)
	    a2[i]=sc.nextInt();
	    while(m<n1 && n<n2){
	        if(a1[m]<a2[n])
	        a3[k++]=a1[m++];
	        else
	        a3[k++]=a2[n++];
	    }
	    while(m<n1)
	    a3[k++]=a1[m++];
	    while(n<n2)
	    a3[k++]=a2[n++];
	    for(int u=0;u<n1+n2;u++)
		System.out.print(a3[u]+" ");
	}
}