Web Reference: Jan 16, 2026 · When this exception occurs in the main thread, it can disrupt the normal flow of the program. In this blog, we will explore the fundamental concepts, usage methods, common practices, and best practices related to handling `InputMismatchException` in the main thread. Thrown by a Scanner to indicate that the token retrieved does not match the pattern for the expected type, or that the token is out of range for the expected type. Constructs an InputMismatchException with null as its error message string. Maybe the scanner was not able to parse what you entered into the console? For example, it asked for a number, you entered "hello"? Try doing "nextFloat" instead. Remove Scanner reader = new Scanner (System.in); from the askForMarks (); Everything works for me then. Instead of using a dot, like: 1.2, try to input like this: 1,2.
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