Consider an example of a book. The book contains pages where pages contain words. Now if a user wants to figure out the occurrence of a word of his own choice then the reader’s head rebound of question does that word to be searched even exist in the book And if yes, starts flipping out the pages prior to remembering the page where it last occurred because there may be chances that the word would repeat after the page which he updated the last and is done reading the book.  

Here the set of all the words in the book is referred to as ‘String’ and the word to be searched is referred to as ‘word’ itself. The exact place where the word occurred is referred to as ‘index’.

java.util.String.lastIndexOf()

Return type:

• Positive Numeric value: Value at which the last occurrence of a character or substring in a string is matched
• -1  If not matched   

Approach:

• Create a category with the name.
• Declare a variable with a reputation string and initialize the variable with value as “geeksforgeeks”
• Now declare another variable with name word and initialize the variable with value as “geeks”. This word is that the search word during this scenario.
• After initializing with the worth now we will use the lastIndexOf() method and will pass the string and word as an argument.
• After following the above steps then compile the program.
• Once the program is compiled you'll get the output.

Example 1:

// Java Program to find the Last
// Index of a particular word
// in a string

// Importing Classes/Files
import java.util.*;

public class GFG {

	// Main driver method
	public static void main(String[] args)
	{

		// String in which char or
		// substring to be searched
		String str = "geeksforgeeks";

		// Substring to be searched
		String word = "geeks";

		// Printing last index of char
		// or substring is found
		// Printing -1 is not found
		System.out.println(str.lastIndexOf(word));
	}
}

Output

8

Example 2: Considering where the character or substring is not present in the string then it will return a ‘-1’ value. 

// Java Program to find the Last
// Index of a particular word
// in a string

// Importing Classes/Files
import java.util.*;
public class GFG {

	// Main driver method
	public static void main(String[] args)
	{

		// String in which char or
		// substring to be searched
		String str = "geeksforgeek";

		// Substring to be searched
		String word = "gfg";

		// Printing last index of char
		// or substring is found
		// Printing -1 is not found
		System.out.println(str.lastIndexOf(word));
	}
}

Output

-1