java error: main class not found or unable to load solution

When using the java command to run the .class file, "Error: The main class cannot be found or cannot be loaded": (Recommended: java video tutorial)

Solution:

Use the java package name and class name to execute, as follows: use java com.lznb.cloud.TCPEchoClient under src

Cause:

1. By default, the java command searches for the address of the class file in the directory specified in the CLASSPATH environment variable.

2. We ignore the impact of package.

Note:

Use the java command in the main directory to execute: java com.lznb.cloud.TCPEchoClient. The path is repeated, so here we need to execute it under src

Summary:

1. The java execution class file is found according to the place specified by CLASSPATH, not the current directory that we understand. If you want it to query the current directory, you need to add ".;" to CLASSPATH to represent the current directory.

2. Java execution class files are strongly dependent on the package path. When it is executed, it will be strictly based on the current user path, and convert the package path specified by the package into a file path to search for class files

For more java knowledge, please pay attention to the java basic tutorial column .

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