The .lastIndexOf() method returns the index of the last (rightmost) occurrence of a substring in the StringBuilder. If a substring is not found, -1 is returned.


myStringBuilder.lastIndexOf(substring, index);

The argument substring is the String being matched.

The index is an int argument that is optional. If provided, .lastIndexOf() returns the last occurrence of substring prior to that index in the StringBuilder.


The following example creates a StringBuilder with a specified string and then uses .lastIndexOf() to find the final occurrence of a particular character:

import java.util.*;
public class Example {
public static void main(String[] args)
StringBuilder str = new StringBuilder("Hello World!");

This produces the following output:

Hello World!

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