Why Am I Getting a 'Main Method Not Found' Error in My Java Program?

"Error: Main Method Not Found" in Java

When attempting to execute a Java program from the command line, developers often encounter errors related to the "main" method. These errors can arise due to various reasons.

Cause of the Error

The "Main method not found" error occurs when the Java virtual machine (JVM) cannot locate a method named "main" that meets specific requirements within the specified class. This method serves as the entry point for the Java application, fulfilling certain criteria:

• It must be present in the designated class.
• It must be named "main" with precise capitalization.
• It must have public visibility.
• It must be declared static.
• Its return type must be void.
• It must take a single argument of type String[].

Requirements for the Main Method

The main method is crucial for initializing and running Java applications. It must strictly adhere to these requirements to function properly:

• Public Access: The method must be publicly accessible, allowing any other class to call it.
• Static Nature: It must be declared static, as it does not operate on a specific instance object.
• Void Return Type: It must return void, indicating that it does not return any value.
• String[] Argument: It takes a single argument, an array of strings, representing the command-line arguments passed to the program.

Troubleshooting the Error

To fix the "Main method not found" error, follow these steps:

1. Verify that the class has a main method.
2. Ensure the method meets all the requirements outlined above.
3. Check for any trailing whitespace or other syntax errors in the class definition.
4. Confirm that the classpath is correctly set and includes the appropriate JAR files.
5. If all else fails, try restarting the IDE or Java runtime environment.

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