Java StringBuilder setCharAt(int index, char ch) Method Explained | Java Tutorial

In Java, the StringBuilder class provides a method called setCharAt(int index, char ch), which allows you to replace the character at the specified index with the given character. This method is particularly useful when you need to modify individual characters within a StringBuilder object.

Here's a detailed description of the setCharAt(int index, char ch) method:

- **Functionality**: The setCharAt(int index, char ch) method replaces the character at the specified index in the StringBuilder object with the specified character.

- **Parameters**:
- `index`: An integer representing the index of the character to be replaced.
- `ch`: A char value representing the character to replace the existing character at the specified index.

- **Return Type**: void (This method does not return anything.)

- **Indexing**: The index parameter specifies the position of the character to be replaced. Indexing starts from 0, so the first character is at index 0, the second at index 1, and so on.

- **Use Case**: You might use setCharAt(int index, char ch) when you need to dynamically change specific characters in a StringBuilder, such as correcting a typo or updating values based on certain conditions.

- **Performance**: This method provides an efficient way to modify individual characters within a StringBuilder object, as it directly modifies the underlying character array without creating new string objects.

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Java StringBuilder [setCharAt(int index, char ch) method] | Java Tutorial

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