How do i convert a string to an object in java?

I have a method that adds a song to a playlist. it calls another method in a different cl to format the name of the song and the song artist so that they look like "Song Name by Song Artist". What is the syntax to create a "Song" object and save the formatted "Song Name by Song Artist". This program does not actually play a song... but its supposed to act like it does. This is for an entry level java course. Any help would be awesome... if more information is needed, i can repost some of my code if need be. Thanks for any future help!