How to Resolve NoSuchElementException on Scanner in Java: A Clear Guide

Are you facing a `NoSuchElementException` when using Scanner in Java? Explore our step-by-step guide to troubleshoot and fix this common issue.
---

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: NoSuchElementException on Scanner, how do i get rid of it?

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Resolve NoSuchElementException on Scanner in Java: A Clear Guide

If you're working with Java's Scanner class, you may have encountered the dreaded NoSuchElementException. This can be especially frustrating if you're unclear about what triggered this error in the first place. In this guide, we will break down the problem and provide a clear solution to help you bypass this issue effectively.

Understanding the NoSuchElementException

The NoSuchElementException is thrown by the Scanner class when trying to read an element that isn't available. This typically occurs when you call methods like next() or nextLine() on a Scanner object, but there are no more tokens (elements) available for retrieval.

Common Reasons for This Exception:

Calling next() without checking if there's a next element.

Invoking next() multiple times without storing the result, thus consuming the elements prematurely.

Problem Breakdown

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

Solution: Refactoring Your Code

Step-by-Step Solution

Store the Value of next() in a Variable: This prevents consuming the token multiple times.

Use the Stored Variable for Further Processing: This allows you to check and manipulate the token as needed.

Updated Code Example:

Here’s the corrected version of the original code:

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

Key Takeaways

Avoid Multiple Calls: Make sure you are not calling next() or any similar function more than once on the same Scanner object without storing the output.

Check Conditions Thoroughly: Ensure that your checks (like hasNext()) are aligned with how you are consuming elements from the Scanner.

By following these steps, you should be able to eliminate the NoSuchElementException and make your code function as intended. Happy coding!