Java Basics
Java Object Oriented
Java Advanced
Java Useful References
Java Useful Resources
Selected Reading
© 2011 TutorialsPoint.COM
|
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:
Return Value :
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
|
|
|
|