public class ThisTest
{
   public static void main( String [] args )
   {
       SimpleTime time = new SimpleTime( 15, 30, 19 );
       System.out.println( time.buildString() );
   }
}

class SimpleTime
{
    private int hour;
    private int minute;
    private int second;

    public SimpleTime( int hour, int minute, int second )
    {
        this.hour = hour;
        this.minute = minute;
        this.second = second;
    } // end SimpleTime

    public String buildString()
    {
        return String.format ("%24s: %s\n%24s: %s",
            "this.toUniversalString()", this.toUniversalString(),
            "toUniversalString()", toUniversalString() );
    }

    public String toUniversalString()
    {
        return String.format( "%02d:%02d:%02d",
            this.hour, this.minute, this.second );
    }
}