Understanding the state of the program's internal runtime

The way to read the source code: Any program is only in the running state, can suddenly reveal its intrinsic value. You should look at the problem from the point of view of the program, not rigidly to the source code itself.

Log output and debug source code are the best way to learn the mechanism of framework operation.

Debug Source: Add the jar file to the project's classpath, and enclose the corresponding source code for the jar files added to the classpath. Right-click the jar file, select the Properties tab, pop up the property options box for the jar file, select the Java Source Attachment option on the left side of the tab, click the button to the right of the input box, Specify the corresponding source code in the directory or the source of the jar file (zip file), click the OK button, the library file is attached to the corresponding source code (at this time, we will find the form of the jar file source code forms of Management convenience, We can even store the source code files in one of the repository directories of workspace and be referenced by all library files.

After the library file is attached to the source code, expand the library file, and double-click on the class file, you can see the corresponding source of the class file. Debug mode can be used for debugging the source code.

Understanding the state of the program's internal runtime