Скачать или смотреть Entering Multiple Strings into an Array with a Sentinel Value in Java

Discover how to effectively collect multiple strings in Java using a sentinel value to terminate input and store them in an array.
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This video is based on the question https://stackoverflow.com/q/64395174/ asked by the user 'Jasper Sommer' ( https://stackoverflow.com/u/13792295/ ) and on the answer https://stackoverflow.com/a/64395322/ provided by the user 'Nikolay Bonev' ( https://stackoverflow.com/u/6055000/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Enter Multiple Strings on One Line with a Sentinel Value in Java

When working with user input in Java, there may be times when you want to enter multiple strings on a single line, but stop collecting input once a specific signal, called a sentinel value, is encountered. For example, you might want to collect course names from a user until they enter "xxx" to indicate they are done. If you're running into issues with your code not working as expected, you’ve come to the right place! In this guide, we will explore how to implement this functionality correctly.

The Problem

You may have encountered issues with a for loop not functioning as intended when trying to collect strings with a sentinel value. If your current loop logic seems to be only grabbing the last string entered before the sentinel, there are certain factors to consider that will help us breakdown how to achieve this correctly.

Understanding the Approach

Key Components

Java Scanner: We will use the java.util.Scanner class to handle input.

Fixed Array: We will collect the strings in an array of a predefined size (e.g., size 5).

Sentinel Value: We will define "xxx" as the sentinel value that will stop further input once entered.

Common Issues in the Original Code

Variable Mismanagement: The original loop structure does not correctly manage reading the inputs.

Handling Input Limits: There is no check on the number of tokens entered which can lead to array out-of-bounds exceptions.

Implementing the Solution

Here’s a step-by-step guide to implement the functionality correctly:

Step 1: Set Up Your Scanner

First, ensure you have your Scanner set up to accept input from the console.

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Step 2: Declare the Array

Next, declare an array that will hold the course names. Here we use a fixed size of 5.

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Step 3: Implement the Loop

Now, we will set up a loop to collect the input. We will use input.hasNext() to check if there is more input, and break out of the loop if "xxx" is entered as input.

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Step 4: Closing the Scanner

Don’t forget to close the scanner after usage to free resources.

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Complete Java Code

Putting it all together, your complete Java code will resemble the following:

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Conclusion

By following these steps, you can successfully collect multiple strings into an array in Java by using a sentinel value to stop the input process. This approach ensures that you correctly manage array bounds and gather all required data efficiently. Happy coding!