The substring() method is used to extract a portion of a string based on the specified beginning and ending indexes. It returns a new string that contains the characters from the original string within the given range.
length(): This method returns the length of a string.
indexOf(String str): This method returns the index within this string of the first occurrence of the specified substring.
replace(char oldChar, char newChar): This method replaces all occurrences of a specified character in a string with another character.
AP Computer Science A - Unit 2 Overview: Using Objects
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