java how to replace 2 or more spaces with single space in string and delete leading and trailing spa

## Java: Replacing Multiple Spaces with Single Space and Removing Leading/Trailing Spaces

This tutorial provides a comprehensive guide on how to replace multiple spaces with a single space and remove leading/trailing spaces from a string in Java. We'll explore different approaches, explain the underlying logic, and provide clear code examples with explanations.

**Understanding the Problem:**

The goal is to normalize strings that might contain inconsistent spacing. Imagine you have the following string:

We want to transform this string into:

Notice that:

* Multiple spaces between "Hello" and "World", "World" and "!", and before/after "!" have been replaced with a single space.
* Leading spaces before "Hello" have been removed.
* Trailing spaces after "!" have been removed.

**Methods for Achieving the Goal:**

We'll explore several methods, each with its own advantages and considerations.

This is generally the most concise and efficient approach. It combines two built-in `String` methods:

**Code Example:**



**Explanation:**

* **`replac ...

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