title: Memory usage with and without initialization to null
body: <p>Does not initialising an instance variable save any memory?</p>
  
  <p>For example, comparing the following two classes:</p>
  
  <pre><code>public class Class1 {
      private String s;
      // getter/setter for s
  }
  
  public class Class2 {
      private String s = "";
      // getter/setter for s
  }
  </code></pre>
  
  <p>Assuming there's already a String constant of <code>""</code> elsewhere, does <code>new Class1()</code> consume less memory than <code>new Class2()</code>?</p>