Which of the following is a recursive method?public static int length(String str) { if (str == null || str.equals("")) return 0; else return 1 + length(str.substring(1)); }public static int length(Strin str) { if (str == null || str.equals("")) return 0; else return 1; }public static int length(Strin str) { if (str == null || str.equals("")) return 0; else return 1 + len(str.substring(1)); }public static int length(String str) { if (str == null || str.equals("")) return 0; }Describe the reason of your choice.

Given : - In the above question, function declaration & definitions would be given and,…

Answered: recursive method

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Which of the following is a recursive method?
1. public static int length(String str) { if (str == null || str.equals("")) return 0; else return 1 + length(str.substring(1)); }
2. public static int length(Strin str) { if (str == null || str.equals("")) return 0; else return 1; }
3. public static int length(Strin str) { if (str == null || str.equals("")) return 0; else return 1 + len(str.substring(1)); }
4. public static int length(String str) { if (str == null || str.equals("")) return 0; }
Describe the reason of your choice.

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