Java – String lastIndexOf() Method

Description:

This method has following variants:

  • int lastIndexOf(int ch): Returns the index within this string of the last occurrence of the specified character or -1 if the character does not occur.

  • public int lastIndexOf(int ch, int fromIndex): Returns the index of the last occurrence of the character in the character sequence represented by this object that is less than or equal to fromIndex, or -1 if the character does not occur before that point.

  • public int lastIndexOf(String str): If the string argument occurs one or more times as a substring within this object, then it returns the index of the first character of the last such substring is returned. If it does not occur as a substring, -1 is returned.

  • public int lastIndexOf(String str, int fromIndex): Returns the index within this string of the last occurrence of the specified substring, searching backward starting at the specified index.

Syntax:

Here is the syntax of this method:

int lastIndexOf(int ch)

or

public int lastIndexOf(int ch, int fromIndex)

or

public int lastIndexOf(String str)

or

public int lastIndexOf(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:

This method returns the index.

Example:

import java.io.*;

public class Test {

   public static void main(String args[]) {
      String Str = new String("Welcome to dineshonjava.com");
      String SubStr1 = new String("Dinesh Tutorials" );
      String SubStr2 = new String("Good Tutorials" );

      System.out.print("Found Last Index :" );
      System.out.println(Str.lastIndexOf( 'o' ));
      System.out.print("Found Last Index :" );
      System.out.println(Str.lastIndexOf( 'o', 5 ));
      System.out.print("Found Last Index :" );
      System.out.println( Str.lastIndexOf( SubStr1 ));
      System.out.print("Found Last Index :" );
      System.out.println( Str.lastIndexOf( SubStr1, 15 ));
      System.out.print("Found Last Index :" );
      System.out.println(Str.lastIndexOf( SubStr2 ));
   }
}

This produces following result:

output:
Found Last Index :25
Found Last Index :4
Found Last Index :-1
Found Last Index :-1
Found Last Index :-1

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Dinesh Rajput

Dinesh Rajput is the chief editor of a website Dineshonjava, a technical blog dedicated to the Spring and Java technologies. It has a series of articles related to Java technologies. Dinesh has been a Spring enthusiast since 2008 and is a Pivotal Certified Spring Professional, an author of a book Spring 5 Design Pattern, and a blogger. He has more than 10 years of experience with different aspects of Spring and Java design and development. His core expertise lies in the latest version of Spring Framework, Spring Boot, Spring Security, creating REST APIs, Microservice Architecture, Reactive Pattern, Spring AOP, Design Patterns, Struts, Hibernate, Web Services, Spring Batch, Cassandra, MongoDB, and Web Application Design and Architecture. He is currently working as a technology manager at a leading product and web development company. He worked as a developer and tech lead at the Bennett, Coleman & Co. Ltd and was the first developer in his previous company, Paytm. Dinesh is passionate about the latest Java technologies and loves to write technical blogs related to it. He is a very active member of the Java and Spring community on different forums. When it comes to the Spring Framework and Java, Dinesh tops the list!

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