The syntax of the String lastIndexOf() method either
string.lastIndexOf(int ch, int index)
or
string.lastIndexOf(string str, int index)
lastIndexOf() Parameters
To find the last index of a character, lastIndexOf() takes these two parameters:
- ch - the character whose last index is to be found
- index (optional) - if
indexis passed, thechcharacter is searched from start to this index
To find the last index of the specified substring within the string, lastIndexOf() takes these two parameters:
- str - the string whose last index is to be found
- index (optional) - if
indexis passed, thestrstring is searched from start to this index
lastIndexOf() Return Value
- returns the index of the last occurrence of the specified character/string
- returns -1 if the specified character/string is not found.
Example 1: Java String lastIndexOf()
Note: The character 'a' occurs multiple times in the "Learn Java" string. The lastIndexOf() method returns the index of the last occurrence of 'a' (which is 9).
Example 2: lastIndexOf() With fromIndex Parameter
Notes:
- The last occurrence of
'r'in the"Learn Java programming"string is at index 15. However,str1.lastIndexOf('r', 4)searches the substring"Learn". The last index of'r'in"Learn"is at index 3. str1.lastIndexOf('r', 12)searches the substring"Learn Java pr". The last index of'r'in"Learn Java pr"is at index 12.str1.lastIndexOf("Java", 4)searches the substring"Learn". Since there is no"Java"in the"Learn"substring, the result is -1.
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