What to do if java cannot open the file

What should I do if java cannot open the file?

First check whether your JDK is installed successfully, and secondly check whether your environment variables are configured or configured successfully.

If the jar file supports direct operation, the code in the jar will be executed when opened;

If you want to see the code in the jar file, you must use decompilation software to view the code, because both It has been compiled into a .class file, not a .java file.

Recommended tutorial: "java learning"

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