How do I get IntelliJ 10.5 (on the Mac) to generate a class diagram showing all of the classes in my project? I'm sure I'm overlooking something obvious, but I can only get the "Show Diagram" feature to show one class at a time. (I also figured out how to add additional classes, but again, only one at a time.)
This question is related to
java
intellij-idea
uml
class-diagram
The answer is
Use Intellij plugin Sketch It!.
Try Ctrl+Alt+U
Also check if the UML plugin is activated (settings -> plugin, settings can be opened by Ctrl+Alt+S
Now there is an official way to add "PlantUML integration" plugin to your JetBrains product.
Installation steps please refer: https://stackoverflow.com/a/53387418/5320704
IntelliJ IDEA 14+
Show diagram popup
Right click on a type/class/package > Diagrams > Show Diagram Popup...
or Ctrl+Alt+UShow diagram (opens a new tab)
Right click on a type/class/package > Diagrams > Show Diagram...
or Ctrl+Alt+Shift+U
By default, you see only the classes/interfaces names. If you want to see more details, go to File > Settings... > Tools > Diagrams and check what you want (E.g.: Fields, Methods, etc.)
P.S.: You need IntelliJ IDEA Ultimate, because this feature is not supported in Community Edition. If you go to File > Settings... > Plugins, you can see that there is not UML Support plugin in Community Edition.
Source: Stackoverflow.com