Mastering Character Swapping in Java: A Beginner’s Guide

Learn how to swap characters effortlessly with a step-by-step approach

Photo by Towfiqu barbhuiya on Unsplash

In this article, we’ll walk you through a step-by-step process to create a function that replaces all instances of character c1 with character c2 and vice versa. By the end, you’ll have a solid understanding of how to tackle this problem. Let’s dive in!

Step 1: Understand the Problem

Before we start coding, let’s make sure we understand the problem. We need to create a function that takes a string and two characters, c1 and c2, as input. The function should replace all instances of c1 with c2 and vice versa. It’s important to note that both characters will appear at least once in the string.

For example:

• doubleSwap(“aabbccc”, ‘a’, ‘b’) should return bbaaccc
• doubleSwap(“random w#rds writt&n h&r&”, ‘#’, ‘&’) should return random w&rds writt#n h#r#
• doubleSwap(“128 895 556 788 999”, ‘8’, ‘9’) should return 129 985 556 799 888

Step 2: Plan the Approach

To solve this problem, we’ll follow a simple plan:

1. Convert the input string into a character array to make it easier to…