This method has following different variants:
- public int indexOf(int ch): Returns the index within this string of the first occurrence of the specified character or -1 if the character does not occur.
- public int indexOf(int ch, int fromIndex): Returns the index within this string of the first occurrence of the specified character, starting the search at the specified index or -1 if the character does not occur.
- int indexOf(String str): Returns the index within this string of the first occurrence of the specified substring. If it does not occur as a substring, -1 is returned.
- int indexOf(String str, int fromIndex): Returns the index within this string of the first occurrence of the specified substring, starting at the specified index. If it does not occur, -1 is returned.
Syntax:
Here is the syntax of this method:
public int indexOf(int ch ) or public int indexOf(int ch, int fromIndex) or int indexOf(String str) or int indexOf(String str, int fromIndex)
Parameters:
Here is the detail of parameters:
- ch — a character.
- fromIndex — the index to start the search from.
- str — a string.
Return Value:
See the description.
Example:
import java.io.*; public class Test { public static void main(String args[]) { String Str = new String("Welcome to www.dineshonjava.com"); String SubStr1 = new String("Tutorials"); String SubStr2 = new String("Sutorials"); System.out.print("Found Index :" ); System.out.println(Str.indexOf( 'o' )); System.out.print("Found Index :" ); System.out.println(Str.indexOf( 'o', 5 )); System.out.print("Found Index :" ); System.out.println( Str.indexOf( SubStr1 )); System.out.print("Found Index :" ); System.out.println( Str.indexOf( SubStr1, 15 )); System.out.print("Found Index :" ); System.out.println(Str.indexOf( SubStr2 )); } }
This produces following result:
Found Index :4
Found Index :9
Found Index :-1
Found Index :-1
Found Index :-1