Web Reference: Mar 13, 2026 · A custom exception in Java is an exception defined by the user to handle specific application requirements. These exceptions extend either the Exception class (for checked exceptions) or the RuntimeException class (for unchecked exceptions). In this tutorial, we’ll cover how to create a custom exception in Java. We’ll show how user-defined exceptions are implemented and used for both checked and unchecked exceptions. To raise an exception, simply pass the appropriate instance to throw, normally: throw new MyFormatExpcetion("spaces are not allowed"); -- you could even use the standard ParseException, without "creating" a custom exception type.
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