title: Overriding User Library Classes in Java
body: <p>I code java with BlueJ for Mac. I have added the stdlib.jar library (From princeton <a href="http://introcs.cs.princeton.edu/java/stdlib/" rel="nofollow">http://introcs.cs.princeton.edu/java/stdlib/</a>). Before added this library I had my own class named StdDraw.java (The specific class I was using on the project) and copy/pasted the code. I also adjusted some of the code and added some new lines. Since I cannot edit the libraries code, how may I override or extend library classes to add additional functionality?</p>