Java Inheritance and Wrapping -

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i have generated object want to:

  1. preserve existing functionality of without injecting constructor , rewriting every method call injectedobject.samemethod().
  2. add additional functionality generated object without modifying generated object.

add additional functionality to.

for example:

public class generatedobject {     public string getthis() { ... }     public string getthat() { ... } }  public interface objectwrapper {     string dothiswiththat(); }  public class objectwrapperimpl extends generatedobject implements objectwrapper {     string dothiswiththat() { ... } }

however, downcasting not allowed, proper implementation without rewriting bunch of redundant code wrap object?

i think decorator pattern may you: "the decorator pattern can used extend (decorate) functionality of object @ run-time, independently of other instances of same class"


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