How to Avoid `NoSuchElementException` When Using Java's `Scanner`?

Debugging NoSuchElementException in Java

When encountering the "NoSuchElementException" while using Java's Scanner class, it indicates a discrepancy between the input provided and the class's expectations. The error occurs when the Scanner attempts to retrieve a value but none is found.

Consider the following code snippet:

If the user enters only one integer and presses enter before inputting the second, it will throw a NoSuchElementException.

Solution

To resolve this issue, check for the availability of another integer before reading it. Here's a modified version of the code:

By incorporating this check, the code ensures that it only reads an integer when one is available, preventing the exception.

Alternative Option

Another approach is to use the hasNextLine() method to check if there is any further input and then call nextLine() to clear the buffer before attempting to retrieve another integer.

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