State the purpose and return data type of the following String functio

State the purpose and return data type of the following String functions :(i) indexOf(). (ii) compareTo().

Answer»

(i) This method returns the first occurance of a character or a sub-string in the string. It returns integer value.

e.g. : int r = s1.indexOF(“DAY”);

string s1 = “HAPPY BIRTHDAY”;

System.out.println(r); Output : 11

(ii) This method compare the invoking string with string object str exicographically & returns an integer value.

e.g. :

string s1 = “GOD”; if (s1.compare To (“OQ”)= = 0)

System.out.println (“equal”);

Output : <Nothing>

The result of the comparison is returned and is interpreted as shown here :

Value returned	Meaning
Less than zero	The invoking string is less than str.
Greater than zero	The invoking string is greater than str
Zero	The two string are equal.