Rewrite the following program using while loop:

import java.io.*; 
class Sample
{
public static void main(String args[]) throws IOException
{
int n,r;
InputStreamReader read = new InputStreamReader(System.in); 
BufferedReader in = new BufferedReader(read); 
System.out.println("Enter a number"); 
n=Integer.parseInt(in.readLine());
do
{
r=n%10;
n=n/10;
System.out.println(r);
}
while(n!=0);
}
}

Write the program in Java to display the first ten terms of the following series:

1, 4, 9, 16,

Write the program in Java to display the first ten terms of the following series:

3, 6, 9, 12,

Write the program in Java to display the first ten terms of the following series:

4, 8, 16, 32,