String methods

Method name Description
charAt(index) character at given index
indexOf(str) index where the start of the given String appears in this string (-1 if not found)
length() number of characters in this String
replace(str1, str2) a new string with all occurrences of str1 changed to str2
substring(index1, index2)
or substring(index1)
the characters in this string from index1 (inclusive) to index2 (exclusive); if index2 is omitted, grabs till end of string
toLowerCase() a new string with all lowercase letters
toUpperCase() a new string with all uppercase letters