What is the difference between ClassNotFoundException and ClassNotFoundException in Java?

ClassNotFoundException and NoClassDefFoundError in Java are both class-related exceptions, but they have some differences in some aspects.

ClassNotFoundException is a Checked Exception that is thrown when trying to load a class through a string and the .class file corresponding to the class cannot be found. This exception generally occurs in methods such as Class.forName() and ClassLoader.loadClass().

NoClassDefFoundError is an Error that is thrown when the virtual machine finds that a certain class needs to be used during operation, but the definition file of the class cannot be found. This exception usually occurs during runtime, usually when the class definition is loaded.

The main difference lies in the different types of exceptions and the different timings of their occurrence. ClassNotFoundException is a Checked Exception that needs to be processed in the code. This exception is generally encountered when using reflection to load a class; and NoClassDefFoundError is an Error, which is usually output in the log and is generally caused by class path problems or class loading failures. .

NoSuchFieldException and NoSuchMethodException are also somewhat similar to ClassNotFoundException. They are both Checked Exception. NoSuchFieldException is an exception thrown when trying to access a non-existent member variable through reflection; NoSuchMethodException is an exception thrown when trying to call a non-existent method through reflection.

In general, exceptions and errors in Java are designed to improve the robustness and reliability of the program. We need to consider exception handling when writing code to avoid problems when running can be handled and resolved in a timely manner.

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