Web | This Site

Java Basics
Java Object Oriented
Java Advanced
Java Useful References
Java Useful Resources
Selected Reading
© 2011 TutorialsPoint.COM

| Home |  | References |  | Discussion Forums |  | About TP

# Java - String indexOf() Method

## Description:

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 Tutorialspoint.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 :11
    Found Index :-1
    Found Index :-1

Advertisement

Online Image Processing

Indian Baby Names