Program : Copy all the element of 2 arrays into third array

import java.util.Scanner;
public class ATS
{
public  static void main(String[]args)
{
Scanner in = new Scanner(System.in);
int P[] = new int[6];
int Q[] = new int[4];
int R[] = new int[10];
int i = 0;
System.out.println("Enter 6 elements of array P:");
for (i = 0; i < P.length; i++)
{
P[i] = in.nextInt();
        }
System.out.println("Enter 4 elements of array Q:");
for (i = 0; i < Q.length; i++)
{
Q[i] = in.nextInt();       
}
        i = 0;
while(i < P.length)
{
R[i] = P[i];           
i++;       
}
int j = 0;
while(j < Q.length)
{
R[i++] = Q[j++];       
}
System.out.println("Elements of Array R:");
for (i = 0; i < R.length; i++)
{
System.out.print(R[i] + " ");       
}   
}
}