What is CharSequence?

CharSequence is an interface in Java that represents a sequence of characters.

Main features:

• Immutable: Most implementations, such as String, are immutable, meaning their contents cannot be changed after creation.
• Readable: Provides methods to access characters by index (charAt(int index)), get length (length()), and obtain subsequences (subSequence(int start, int end)).
• Common interface: Allows handling various types of character sequences (strings, buffers, etc.) uniformly.

Examples of implementations:

• String
• StringBuffer
• StringBuilder

Why use CharSequence?

• Allows functions to accept any type of character sequence, not just String. This increases flexibility and code reusability.
• Avoids the need to convert different sequence types to String before use, which can be inefficient.