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Discover how to leverage Java's `printf()` function to elegantly display text within a decorative box of asterisks. Perfect for string arrays!
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How to Use printf() to Create a Text Box with Centered Text in Java

Creating an aesthetically pleasing output in Java can enhance the user experience significantly. Have you ever wondered how to display words within a box made of asterisks, with the text perfectly centered? In this guide, we will tackle this challenge by using the printf() function while providing a dynamic approach that adjusts the box size based on the inputted strings.

Problem Introduction

Imagine you have an array of strings that you want to display to the user, each line of text neatly formatted within a box composed of asterisks. For example, given the input strings "Nivla" and "not intelligent," the output should look like this:

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The challenge lies in ensuring that:

The box size automatically adjusts based on the longest string.

The text is centered within the box.

Let's dive into the solution!

Solution Overview

To accomplish this task, we will follow a systematic approach:

Input Gathering: We will collect user input into an array of strings.

Calculate Maximum Length: Determine the length of the longest string to define the size of our box.

Dynamic Centering: Center each string based on its length relative to the maximum length identified.

Construct and Print the Box: Finally, create and print a box of asterisks surrounding the centered text.

Step 1: Input Gathering

We will utilize a Scanner to read multiple lines of input. The input collection will continue until an empty line is entered.

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

Step 2: Calculating Maximum Length

As we add strings to our list, we simultaneously update a max variable that stores the length of the longest string. This will be crucial for centering and box size calculations.

Step 3: Dynamic Centering

To ensure that each string is centered appropriately, we will calculate the required padding. The padding will be dependent on the length of the string compared to the maximum length:

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

Step 4: Constructing and Printing the Box

We need a utility method to print the upper and lower borders of our box:

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

Complete Code

Here’s how the complete code looks:

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

Conclusion

With this implementation, we have a flexible way to display any number of strings within a stylized box, complete with centered text. This practice not only enhances the output visually but also demonstrates effective use of Java's printf() method to format text dynamically.

If you have any questions or additional features you'd like to implement, feel free to leave a comment below!