Question

Describe the purpose of the following function with its syntax:

indexOf()

Answer 1

This function returns the character's index (i.e., position number ) in the String. It returns −1, if the character is not available in the String.

Example: 

String t = "Calculator"; 

• t.indexOf('u') returns 4.
• The function t.indexOf('l', 3) returns 5 if 'I' appears after the 3rd place.
• t.indexOf('b') returns −1 since 'b' does not exist in the String.