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Learn how to effectively use the `Scanner` class in Java by creating methods for input reading and output displaying. This guide guides you through structuring your code for better readability and functionality.
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How to Use Scanner Effectively in Java with Methods

In Java programming, organizing your code is crucial for readability and maintainability. A common requirement for many applications is to read user input through the Scanner class. However, it’s best practice to encapsulate this functionality within methods rather than piling all your code into the main method. In this blog, we’ll address how to structure your Java program to utilize a Scanner for user input in one method and display the output in another.

The Problem: Handling User Input and Output

You might find yourself in a situation where you want to ask the user for input, process that input, and then display the results, all while keeping your code organized. Specifically, you want to separate your input actions from your output actions by utilizing methods effectively.

For instance, you might want to:

Read a product name, quantity, and price from the user.

Calculate the total amount due based on the entered quantity and price.

Print the result to the console, but from a different method.

Let’s explore how to achieve this by modifying your code to include separate methods for input (e.g., readInput) and output (e.g., writeOutput).

Solution Breakdown

Step 1: Create Necessary Fields

First, let's define the class and necessary instance variables to store the price, quantity, and amount due:

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

Step 2: Implementing the Scanner in a Dedicated Method

Next, we will create a method dedicated to handling the input using Scanner. This method might look like this:

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

Step 3: Creating the Output Method

Now that we have a method to read inputs, we will implement another method for outputting results:

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

Step 4: Connecting Everything in Main Method

Finally, your main method will need to create an instance of your class and call the input method. Here's how you can keep main clean and concise:

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

Best Practices with Scanner

Do not combine multiple next methods: Using scanner.next() and then scanner.nextLine() can lead to unexpected behavior. Stick with nextLine() or use delimiters properly.

Descriptive method names: Use method names that clearly convey their purpose (readInput, writeOutput).

Conclusion

By implementing these steps, you can separate the logic of reading user input from your program’s output, enhancing both the readability and maintainability of your code. The encapsulation of input and output functionality not only adheres to object-oriented principles but also simplifies debugging and future modifications.

Feel confident in leveraging methods to improve your Java applications, and keep the Scanner usage structured and easy to understand!