How to Take Input After Closing Scanner Class in Java Without Reinitializing it

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Handling Input in Java: Avoiding Scanner Class Pitfalls

When learning Java, one of the common challenges developers face is managing input, particularly when using the Scanner class. A typical issue arises when trying to read input after having closed the scanner. This predicament can lead to errors that can be frustrating to debug. In this blog, we will explore a common scenario that results in a NoSuchElementException and offer solutions to handle input effectively without causing resource leaks.

The Problem: Closing the Scanner

In your code, you attempted to create a method for inputting an array and another method to shift the array contents. Here is a snippet illustrating the problem:

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This error indicates that the input stream is closed, and therefore no further input can be read.

Understanding Resource Management

Correct Input Handling Strategy

Updated Method for Input

The revised method should avoid closing the scanner. Instead, manage the closing of your scanner responsibly. Here’s an updated version of the inputArray method:

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Main Method Adaptation

Next, ensure that your main method uses the same scanner instance throughout:

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Benefits of This Approach

Resource Efficiency: This approach avoids unnecessary complexity while ensuring efficient resource management.

Conclusion