title: How to override/extend an inner class from a subclass?
body: <p>I want to change how a method of a class executes without overriding the method, and only overriding (or ideally extending) the inner class. Assume that I cannot change the fact that I need to do this (I am modifying an existing open source code base and there would be friction to pulling out classes or whatnot).</p>
  
  <pre><code>public class A {
    static class Thing {
      public int value() { return 10+value2(); }
      public int value2() { return 10; }
    }
  
    public String toString() {
      Thing t = new Thing();
      return Integer.toString(t.value());
    }
  }
  
  public class B extends A {
    static class Thing {
      public int value2() { return 20; }
    }
  }
  </code></pre>
  
  <p>My goal is, by changing only Thing, getting B's toString() to return "30", where currently it will return "20". The ideal would be to change only the method value2 (thus leaving any other methods unchanged), but I don't know if this is possible.</p>
  
  <p>Thanks</p>