The idea of the diagram

diagram usage in idea

Reference URL:

https://mp.weixin.qq.com/s/BLIuW_xjN8Tnd0ZxqC1dlQ

Description

This article basically summarizes all the usage of diagram, to prevent loss, collect and reprint a wave

1. View the inheritance chain in graphical form

In the tab of the class you want to view, right-click and select Diagrams, there are show and show … Popup, but the former is newly created in the tab, and the latter is displayed in the form of a floating window:

Actually, you can also right-click on the class you want to view from the project directory tree on the left, and select Diagrams as well, the effect is the same:

Then you will get the inheritance relationship graph as shown below, taking a custom servlet as an example:

It is obvious that:

• The solid blue arrow indicates the inheritance relationship
• The green dotted arrow refers to the interface implementation relationship

2, optimize the inheritance chain graphics, think what I think

2.1 remove unrelated classes

Some of the inheritance relationship graphs obtained are not what we want to know, such as Object and Serializable in the above figure. We only want to care about the important inheritance relationships of Servlet. What should we do?

Simple, delete.Click to select the class you want to delete, then just use the delete key on your keyboard.After cleaning up the relationships of other classes, the graph is as follows:

2.2 Display class details

Some people say, eh, how can that be enough? I also want to see the inherited methods?Simple, IDEA has everything for you.

Right-click on the page, select show categories, and expand the properties, methods, constructors, etc. in the class as needed.Of course, the second method can also directly use the above toolbar:

Then you will get:

What, do you still want to filter in the method, for example, you want to see protected permissions and above?Simple, right-click to select Change Visibility Level, and adjust as needed.

What, do you think the graphics are too small for you to see clearly?IDEA can also satisfy you. Press and hold Alt on the keyboard, and a magnifying glass appears. Is it surprising or unexpected?

2.3 Add other classes to the relationship

When we also need to check whether other classes have an inheritance relationship with the current class, we can choose to add them to the current inheritance relationship graph.

Right-click on the page, select Add Class to Diagram, and then enter the class you want to add:

For example, we added a Student class as shown in the following figure.Well, there is no arrow, it seems that it has no indescribable relationship with the current classes and interfaces:

2.4 View specific code

If you want to view the specific source code of a certain class, such as a certain method, of course, it is impossible to display it on the graphics, otherwise the screen will not be able to explode?

But you can use graphics, or cooperate with IDEA's structure to easily and quickly enter the source code of a class for viewing.

After double-clicking a class, you can walk in the method list under it. For the method you want to view, right-click and select Jump to Source:

After selecting the structure in the left column, all the methods in the class will be displayed on the left as shown in the figure above. Click which method, and the page content will jump to the method section.

3, last

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After selecting the structure in the left column, all the methods in the class will be displayed on the left as shown in the figure above. Click which method, and the page content will jump to the method section.

3, last

Using the IDEA functions mentioned above, learning and viewing class relationships, and understanding things such as mainstream framework source code, can be said to be very comfortable.