Click here to watch in Youtube :
https://www.youtube.com/watch?v=gcZsY4HONso&list=UUhwKlOVR041tngjerWxVccw

/*
 * Converting Numbers to Strings.
 */
public class NumberToStringDemo
{

    public static void main(String[] args)
    {
        /*
         * Each of the Number subclasses includes a class
         * method, toString(), that will convert its
         * primitive type to a string.
         */
        double d = 543.48;
        String s = Double.toString(d);
        System.out.println("s = "+s);

        int dot = s.indexOf('.');

        System.out
                .println(dot + " digits " + "before decimal point.");
        System.out.println((s.length() - dot - 1)
                + " digits after decimal point.");
        
        int i = 190;
        String s3 = Integer.toString(i); 
        System.out.println("s3 = "+s3);

    }
}