Recursion for Coding Interviews in Java

Master recursion in Java for coding interviews, enhance problem-solving skills, and tackle real-world challenges confidently.

Intermediate

51 Lessons

Certificate of Completion

Master recursion in Java for coding interviews, enhance problem-solving skills, and tackle real-world challenges confidently.

AI-POWERED

Mock Interview

Explanations

AI-POWERED

Mock Interview

Explanations

This course includes

38 Playgrounds

9 Challenges

6 Quizzes

This course includes

38 Playgrounds

9 Challenges

6 Quizzes

Course Overview

If you’ve got an interview coming up and want to brush up on your knowledge, or if you’ve ever struggled with solving coding problems using recursion, you'll find this course helpful. You’ll start with the basics of what recursion is and why it’s important before diving into what it looks like in practice. You’ll see how recursion can help you solve a variety of different math, string, and data structure problems by using interactive code playgrounds that you can execute directly in your browser. You’ll h...Show More

Course Content

Fundamentals of Recursion

Learn how to use recursion in Java for efficient problem-solving with practical examples.

What is Recursion?

Recursion and Memory Visualization

Direct vs. Indirect Recursion

When to use Recursion

What to Expect

Understanding a Recursive Problem

Advantages and Disadvantages

Iteration to Recursion

Solve challenges with transforming iterative code to recursive, comparing recursion vs. iteration.

Iteration

Recursion vs. Iteration

Changing Iterative Code to Recursive

Challenge 1: Length of a Linked List

Solution Review: Length of a Linked List

Quick Quiz on Iteration!

Recursion with Numbers

Work your way through core recursion techniques on numbers: power, sum, modulo, Fibonacci, GCD, prime, and binary conversion.

The Exponent of a Number

Sum of Integers from 1 to n

Modulo using Recursion

Computing Fibonacci Sequence

Challenge 1: Find the Greatest Common Divisor

Solution Review: Find the Greatest Common Divisor

Challenge 2: Check for Prime Number

Solution Review: Check for Prime Number

Challenge 3: Convert Decimal Number to Binary Number

Solution Review: Convert Decimal Number to Binary Number

Quick Quiz on Recursion with Numbers!

Recursion with Strings

Enhance your skills in solving string problems through recursive techniques and challenges.

Reversing a String

Removing Duplicates in a String

Merging Strings in Alphabetic Order

Challenge 1: Let's find the total number of vowels!

Solution Review: Let's find the total number of vowels!

Challenge 2: Print all Permutations of a String

Solution Review: Permutations of a String

Challenge 3: Is this String a Palindrome?

Solution Review: Is this String a Palindrome?

Quick Quiz on Recursion with Strings!

Recursion with Arrays

Take a closer look at solving array problems using recursion in Java, including challenges.

Find the First Occurrence of a Number in an Array

Count the Number of Occurrences of a Number in an Array

Replacing each Negative Integer with a 0 in an Array

Invert the Position of Elements in an Array

Challenge 1: Find if the Array is a Palindrome

Solution Review: Find if the Array is a Palindrome

Challenge 2: Sort an Array

Solution Review: Sort an Array

Quick Quiz on Recursion with Arrays!

Recursion with Data Structures

8 Lessons

Follow recursion techniques to solve linked list problems, BST insertions, and graph traversals.

Part of the Java Interview Prep Path

Ace the Java Coding Interview

Learn to tackle anything you might face in a coding interview in Java with absolute confidence.

7 Modules

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Souvik Kundu

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Hands-on Learning Powered by AI

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Instant Code Feedback

Evaluate and debug your code with the click of a button. Get real-time feedback on test cases, including time and space complexity of your solutions.

AI-Powered Mock Interviews

Put your skills to the test in a simulated interview setting. Receive personalized feedback based on your performance. Available in Premium & Premium Plus plans.

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Explain with AI

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AI Code Mentor

AI Code Mentor helps you quickly identify errors in your code, learn from your mistakes, and nudge you in the right direction — just like a 1:1 tutor!

Frequently Asked Questions

Is it a good choice to use recursion in Java interviews?

Recursion is often encouraged in Java interviews, but be mindful of performance and stack limitations, especially with deep recursion.

What are the advantages of recursion over iteration in Java?

Recursion simplifies code for certain problems, like tree traversals, but due to stack overhead, it may be less efficient than iteration for larger datasets.

What are the key recursion techniques I should know for Java interviews?

Focus on mastering basic recursion, tail recursion, and optimizations like memoization to handle complex problems efficiently.

What is a real-life example of recursion in programming?

Navigating directories in a file system is a real-life example of recursion. Each folder can contain files or subfolders, and traversing them mimics recursion.

How many types of recursion are there in Java?

In Java, recursion can be categorized into two types: direct recursion (where a method calls itself) and indirect recursion (where a method is called by another method in a recursive loop).