Using IntelliJ IDEA Diagrams to Visualize Java Servlet Inheritance and Interface Relationships

When you have spare time, you can revisit previously learned concepts such as Java Servlets and use IntelliJ IDEA's diagram tool to obtain a clear graphical view of class inheritance and interface implementation relationships.

1. View the inheritance chain as a diagram

Right‑click the class tab, choose Diagrams → Show Diagram (or the popup version) to open the diagram inside the tab or as a floating window.

You can also right‑click the class in the project tree and select Diagrams for the same effect.

The resulting diagram shows inheritance (blue solid arrows) and interface implementation (green dashed arrows).

2. Optimize the diagram

2.1 Remove irrelevant classes

Select unwanted classes in the diagram and press the Delete key; the cleaned‑up diagram focuses on the important Servlet hierarchy.

2.2 Show class details

Right‑click the diagram and choose Show Categories to expand fields, methods, constructors, etc., or use the toolbar to adjust visibility (e.g., show only protected members).

Use Change Visibility Level to filter methods by access modifier.

Press Alt to activate a magnifier for better readability.

2.3 Add other classes to the diagram

Right‑click and select Add Class to Diagram , then type the class name (e.g., Student ) to include it; if no relationship exists, no arrows will appear.

3. View source code from the diagram

Double‑click a class in the diagram, then right‑click a method and choose Jump to Source** to open its implementation. The Structure view can also list all members for quick navigation.

4. Conclusion

Using IntelliJ IDEA's diagram, structure, and navigation features makes exploring class relationships and source code of mainstream frameworks much more convenient and efficient.