How to Swap Two Strings in Java

Learn how to swap two strings in Java with practical examples. Understand different approaches and choose the one that suits your needs.
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Swapping two strings in Java might seem like a straightforward task, but it requires a proper understanding of Java's reference and memory handling. In Java, strings are immutable, meaning their values cannot be changed once they are assigned. However, you can achieve string swapping using various approaches. Let's explore a few methods to accomplish this task.

Approach 1: Using a Temporary Variable
One common method to swap two strings is by using a temporary variable. Here's how you can do it in Java:

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In this approach, the values of str1 and str2 are exchanged through the temporary variable temp.

Approach 2: Using Concatenation
Another way to swap two strings is by concatenation. Here's an example:

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In this approach, the concatenation of two strings is stored in str1, and then substrings are used to extract and assign the swapped values.

Approach 3: Using StringBuilder Class
You can also utilize the StringBuilder class, which provides a more efficient way to manipulate strings:

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In this approach, the StringBuilder class is used to manipulate the strings efficiently, making the swapping process more convenient.

These are some of the common methods to swap two strings in Java. Choose the one that fits your requirements and coding style. Understanding the underlying concepts of Java's string manipulation will empower you to handle such operations effectively in your programs.

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