What does the substring method of the String class do?

Checks if the string is empty.
Converts the string to lowercase.
Retrieves the string's length.
Returns a new string with a portion of the original string.

The substring() method of the String class in Java returns a new string that is a subset of the original string. It takes two parameters, the starting index and the ending index, and extracts the characters within that range, creating a new string. The other options do not describe the functionality of the substring() method.

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