substring and length java string methods

certainly! in java, the `string` class provides several useful methods for manipulating strings, two of which are `substring()` and `length()`. this tutorial will cover how to use these methods effectively.

1. the `length()` method

the `length()` method is used to determine the number of characters in a string. it returns an integer representing the size of the string.

syntax:

example:

**output:**

2. the `substring()` method

the `substring()` method is used to extract a part of a string based on specified indices. there are two overloaded versions of this method:

- `substring(int beginindex)`: returns a new string that is a substring of this string, starting from the specified `beginindex` to the end of the string.
- `substring(int beginindex, int endindex)`: returns a new string that is a substring of this string, starting from the specified `beginindex` and extending to the character at index `endindex - 1`.

syntax:

example:

**output:**

important notes:
1. **indexing**: java uses 0-based indexing, meaning the first character of the string is at index 0.
2. **bounds**: when using `substring(int beginindex, int endindex)`, the `beginindex` is inclusive, and the `endindex` is exclusive. if you pass indices that are out of bounds, you'll get a `stringindexoutofboundsexception`.
3. **immutable strings**: strings in java are immutable, meaning that once a string is created, it cannot be changed. methods like `substring()` return new string objects.

conclusion

the `length()` and `substring()` methods are fundamental for string manipulation in java. understanding how to use these methods allows you to effectively work with text data in your applications. you can explore further by combining these methods with loops and conditions to perform more complex string operations.

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