Скачать или смотреть How to Read a Word Until Space in Java and Store it in an Array

Learn how to effectively read two words from user input in Java using the Scanner class and store them in an array. Get a step-by-step guide to solve this common programming challenge.
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How to Read a Word Until Space in Java and Store it in an Array

If you're diving into the world of Java programming, you might find yourself needing to read user input frequently. One common task is reading a single word or multiple words separated by spaces. In this guide, we'll explore how to read two words from user input and store them in an array using the Scanner class.

The Problem: Reading User Input

Imagine this scenario: You want to create a simple program that asks the user to input two words. Your goal is to capture each word separately and store them in an array. However, you notice that using nextLine() captures the entire input line instead of separating the words. For example, if the user inputs "mike alpha", the output mistakenly combines them, resulting in unexpected behavior.

Here's the initial code snippet you might have written:

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Input:

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Expected Output:

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Actual Output:

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Clearly, there's a problem when reading the input. Let's dive into the solution.

The Solution: Using next() Instead of nextLine()

To correctly read the two words entered by the user, the key lies in choosing the right method to read input. While nextLine() reads the entire line, next() reads only the next token (word) until a space is encountered.

Here's how you can fix the code:

Updated Code Example

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Breakdown of Changes

Method Change: Replace nextLine() with next().

next() captures the next word, stopping at the first space.

This allows us to read multiple words separately without confusion.

Output: After making the change, if the user inputs "mike alpha", the code now correctly outputs:

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Conclusion

By simply switching from nextLine() to next(), you can effectively read two words from user input into an array in Java. This small adjustment enables your program to handle input more accurately, ensuring that each word is captured as intended.

If you're new to Java, remember this distinction when working with user input! It's a handy trick to have under your belt.

Happy coding!