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Clicking "F3" on the Change class in eclipse,
Change change = refactoring.createChange(monitor);
I could open the Class.java.
public abstract class Change implements IAdaptable {
...
However, I need the concrete Java classes that implements the Change class. How can I find them in eclipse?
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Put the cursor on the name of the interface and press F4 (Open Type Hierarchy). That will open a window that shows a tree with all classes that Eclipse can find that implement the interface.
You can derive concrete classes from an abstract class. You can derive abstract classes from an abstract class. An abstract class can be useful as a common type for parameters in methods. In java, the constructors of a subclass are inherited from its superclass.
A concrete class cannot have an abstract method, because class containing an abstract method must also be abstract. We have a class called “HttpServlet” in Servlet. Now, this class is special in its own way.
The Type Hierarchy shows the same list of implementing types (as they are subclasses of the abstract class). Since it is a view, it can be pinned permanently on the side. However, if you double-click on a type name here, you are taken to the declaration line of the type. You then have to find the implementation of the abstract method yourself.
An abstract class can have both the regular methods and abstract methods. For example, To know about the non-abstract methods, visit Java methods. Here, we will learn about abstract methods.
In the right pane, the highlighted method doService ( request, response ) also has the 'A' icon, indicating that this is an abstract method. Now if we click on the class DispatcherServlet, which is a concrete (not abstract) class, you see this:
You can use the shortcut Ctrl + T to see all implementations of the class.
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Go to
Windows-> Open theOutline View-> Right click on the required class -> SelectOpen Type Hierarchy.
This will open the window with the hierarchy involving that class.
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