Why Am I Getting 'Error: Selection does not contain a main type' in Eclipse?

Resolving "Error: Selection does not contain a main type" in Eclipse for Java Projects

When attempting to execute Java files in a newly created project, encountering the error message "Selection does not contain a main type" can be frustrating. This error arises when the Java Virtual Machine (JVM) is unable to locate a valid main method within the specified selection or directory.

To rectify this issue and ensure that your Java application can be run successfully, follow these steps:

1. Within the Eclipse project explorer, right-click on the folder containing your main class (the class with the public static void main(String[] args) method).
2. In the context menu, navigate to "Build Path" and select "Use as Source Folder." This designates the folder as a source directory, making its contents available to the Java compiler.
3. Right-click on the main Java file and select "Run as" > "Java Application" to initiate the execution process.

Alternative Solution (if "Use as Source Folder" is not visible):

In the event that the "Use as Source Folder" option is not visible in the right-click context menu, perform the following:

1. Within the "Build Path" menu, select the option "Remove from Build Path" for the folder containing the main class.
2. The "Use as Source Folder" option will now appear in the "Build Path" menu. Select it to designate the folder as a source directory.

Once you have incorporated these adjustments, the JVM should successfully compile and execute your main program without encountering the "Selection does not contain a main type" error.

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