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Скачать или смотреть Resolving the Error: Could not find or load main class in Java Nested Classes

  • vlogize
  • 2025-10-10
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Resolving the Error: Could not find or load main class in Java Nested Classes
Error when executing Java code with nested classjavaruntime errorinner classesmain method
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Описание к видео Resolving the Error: Could not find or load main class in Java Nested Classes

A beginner's guide to troubleshooting Java runtime errors, specifically focusing on executing nested classes in Java. Learn how to compile and run your code properly to avoid `ClassNotFoundException`.
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This video is based on the question https://stackoverflow.com/q/68417927/ asked by the user 'Ten Kei' ( https://stackoverflow.com/u/15468444/ ) and on the answer https://stackoverflow.com/a/68418013/ provided by the user 'Uday Chauhan' ( https://stackoverflow.com/u/6821936/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Error when executing Java code with nested class

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
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Resolving the Error: Could not find or load main class in Java Nested Classes

As a newcomer to Java, running into errors can be frustrating. One common issue you might face is executing code that contains nested classes, leading to an error message that states:

[[See Video to Reveal this Text or Code Snippet]]

This error can perplex many, especially when your program seems correctly structured. Today, we will explore why this error occurs and how to solve it effectively.

Understanding the Problem

In Java, nested classes are classes defined within another class. When you compile a file with a nested class, it generates multiple .class files. For instance, given the code snippet below, you will end up with two separate compiled files:

ShadowTest.class (the outer class)

ShadowTest$FirstLevel.class (the inner class)

Let's examine the Java code snippet you provided:

[[See Video to Reveal this Text or Code Snippet]]

In this code, you defined an outer class ShadowTest and an inner class FirstLevel. The main method initializes an instance of both ShadowTest and FirstLevel and executes a method that prints some variables.

Compiling and Running Your Code

To resolve the error, careful attention must be paid to how you are compiling and executing your Java classes. Here’s the step-by-step guide:

1. Compilation

You can compile the Java class by using the following command in your terminal or command prompt:

[[See Video to Reveal this Text or Code Snippet]]

This command produces the necessary class files but does not execute them yet.

2. Execution

Once compiled, you should execute the outer class (ShadowTest) like this:

[[See Video to Reveal this Text or Code Snippet]]

Note: It is important to execute the name of the outer class without any file extension (.class).

Sample Output

If you follow the compilation and execution steps correctly, your terminal should output the following:

[[See Video to Reveal this Text or Code Snippet]]

This output confirms that your method is working correctly, displaying the values defined in both the inner and outer classes.

Key Takeaways

When using nested classes in Java, remember to compile and run the outer class.

The command to compile is javac {filename} and to run it is java {class_name}.

Ensure your Java file and the directories are correctly referenced to avoid errors.

By understanding how to structure your compilation and execution, you'll overcome the ClassNotFoundException and become more confident in your Java programming journey!

If you have any further questions or experience different issues while coding in Java, feel free to ask for assistance.

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