gistfile1.java

public interface Accessor<T> {
  public String getData();
}

public class ClassA {
  private String superAwesomeData = "Woah.";

  public String getSuperAwesomeData() { return this.data; }

}


public class ClassB {

  public <T extends Accessor> void doStuff(T obj) {
    doStuff(obj, obj)
  }

  public <T> void doStuff(T obj, Accessor<T> accessor) {
    obj.getData();
  }


  public static void main(String[] args) {
    final ClassA a = new ClassA();
    
    new ClassB().doStuff(a, new Accessor<ClassA>() {
      public String getData() {
        return a.getSuperAwesomeData();
      }
    });
  }
}