Visualizing Java Servlet Inheritance and Interface Relationships with IntelliJ IDEA Diagrams

When you have free time and want to revisit Java Servlet knowledge, IntelliJ IDEA's diagram tool provides a clear visual representation of class inheritance and interface implementation relationships.

1. Viewing the inheritance diagram

Right‑click the class tab, choose Diagrams → Show (opens in the same tab) or Show ... Popup (opens as a floating window). The same option is also available by right‑clicking the class in the project tree.

2. Optimizing the diagram

2.1 Remove unwanted classes – Select classes such as Object or Serializable that are not of interest and press the Delete key. The cleaned‑up diagram shows only the relevant Servlet hierarchy.

2.2 Show detailed class information – Right‑click the diagram and select Show Categories to expand fields, methods, constructors, etc. You can also use the toolbar to achieve the same effect.

After expanding, the diagram displays members; you can filter by visibility (e.g., show only protected and above) via Change Visibility Level .

Press Alt to activate a magnifier for better readability.

2.3 Add other classes to the diagram – Choose Add Class to Diagram , type the class name (e.g., Student ), and the class appears in the diagram. If no arrows appear, there is no direct inheritance or interface relationship.

2.4 Jump to source code – Double‑click a class in the diagram, then right‑click a method and select Jump to Source to open the implementation. Use the Structure view to list all methods and navigate quickly.

Using the Structure pane on the left, you can see all methods of the selected class and click to jump directly to their definitions.

3. Conclusion

By leveraging IntelliJ IDEA's diagram, categories, visibility filters, zoom, class addition, and source navigation features, you can comfortably explore class relationships and dive into the source code of major frameworks.