Solving java.util.NoSuchElementException in Java

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The Problem

Here's a simplified version of the scenario:

The Circle and Rectangle classes are not structured properly regarding user input handling.

The Scanner is closed prematurely.

The main method lacks proper setup for capturing user input.

The ultimate question we need to answer is: Why does this happen, and how can you fix it?

Solution Overview

Keep the Scanner Static and Centralized:

Place the Scanner instance in the main class and make it static to avoid multiple Scanner instances.

Avoid Closing the Scanner in Different Classes:

Closing the Scanner class will close the underlying input stream. Instead, let the main function handle this.

Use an Abstract Class or Interface for Sharing Code:

Instead of repeating code in the Circle and Rectangle classes for area and perimeter calculations, use an abstract class such as Geoform.

Step-by-Step Implementation

Let’s analyze how those concepts translate into code.

Updated Main Class

Here’s an enhanced version of the Main class that implements these principles:

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

Geoform Abstract Class

To eliminate redundancy in the circle and rectangle calculations, introduce an abstract class:

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

Circle Class

Here’s how the Circle class can inherit from Geoform:

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

Rectangle Class

Similarly, the Rectangle class would look like this:

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

Conclusion

Next time you face this issue, refer back to these guidelines for a robust solution!