.substring()

The .substring() method returns a String object representing a substring of the character sequence currently in a given StringBuilder.

Syntax

myStringBuilder.substring(start, end);

The .substring() method will return the substring starting at the zero-indexed int start index to the character specified at index end - 1. If the int end is omitted, the substring will extend from start to the end of the sequence. If start or end is negative, greater than the length of the StringBuilder, or start is greater than end, a StringIndexOutOfBoundsException is thrown.

Example

The following example creates a StringBuilder with a specified String and displays a substring from it.

import java.util.*;

public class Example {
  public static void main(String[] args)
  {
    StringBuilder str = new StringBuilder("Hello World!");
    System.out.println(str.toString());
    String s1 = str.substring(6,11);
    System.out.println(s1);
  }
}

This produces the following output:

Hello World!
World