Java prompts that the main class cannot be found or cannot be loaded

Problem:

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

Solution:

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

Reason:

1. The address where the java command searches for the class file by default is specified in the CLASSPATH environment variable Looking in the directory.

2. 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 It needs to be executed 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.

Recommended tutorial: Java tutorial

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