Write a program in Java to input a number and print only those digits that are prime

public class Prime_Digits
{
    public static void main(int n)
    {
        int d;
        while(n!=0)
        {
            d = n%10;
            n = n/10;
            if(d==2||d==3||d==5||d==7)
            System.out.println(d);
        }
    }
}