title: Does Java have mutable types for Integer, Float, Double, Long?
body: <p>I am in a situation where I want to use mutable versions of things like Integer. Do I have to use these classes (below) or does Java have something built in?</p>
  
  <p><a href="http://www.java2s.com/Code/Java/Data-Type/Amutableintwrapper.htm" rel="noreferrer">http://www.java2s.com/Code/Java/Data-Type/Amutableintwrapper.htm</a> </p>