如何在Eclipse中附加类的实际实现Java代码？

Question

I have inherited a project that uses calls to an existing jar. The former programmer have had the fortune of obtaining a/the source code of the jar. However the construction is rather complex. I use an abstract class, say Size. In the source code I find an implementation of that class, say SizeProxy. It has an object of class SizeImplementation and any calls on Size.getInfo() will be implemented as a call to this.theSize.getInfo().

In short I have managed to find the actual implementation of getInfo that actually does anything interesting. I would love to make it possible to go from "my" code o_size.getInfo() and go directly to the "implementation" in SizeImplementation.getInfo. Right now I can't make Eclipse do that, possibly because the class names don't match. Please help!

Answer 1

This is in general not possible because an interface can have several implementations, and an abstract class (or any class) can be extended by many classes. Take this example

public void doSomething(boolean option){
    List<String> someList;
    if (option){
         list=new ArrayList<>();
    }else{
         list=new LinkedList<>();
    }

    list.add("Where do I go"); 

}

Were you to attempt to go to the implementing source directly from list.add("Where do I go"); to the implementation of .add() where would you end up? ArrayList's or LinkedList's.

This is why you have to go via the interface or abstract class then choose your implemetation from there