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Typical java interview questions sorted by experience
Junior
* Name some of the characteristics of OO programming languages
* What are the access modifiers you know? What does each one do?
* What is the difference between overriding and overloading a method in Java?
* What’s the difference between an Interface and an abstract class?
* Can an Interface extend another Interface?
* What does the static word mean in Java?
* Can a static method be overridden in Java?
* What is Polymorphism? What about Inheritance?
* Can a constructor be inherited?
* Do objects get passed by reference or value in Java? Elaborate on that.
* What’s the difference between using == and .equals on a string?
* What is the hashCode() and equals() used for?
* What does the interface Serializable do? What about Parcelable in Android?
* Why are Array and ArrayList different? When would you use each?
* What’s the difference between an Integer and int?
* What is a ThreadPool? Is it better than using several “simple” threads?
* What the difference between local, instance and class variables?
Mid
* What is reflection?
* What is dependency injection? Can you name a few libraries? (Have you used any?)
* What are strong, soft and weak references in Java?
* What does the keyword synchronized mean?
* Can you have “memory leaks” on Java?
* Do you need to set references to null on Java/Android?
* What does it means to say that a String is immutable?
* What are transient and volatile modifiers?
* What is the finalize() method?
* How does the try{} finally{} works?
* What is the difference between instantiation and initialisation of an object?
* When is a static block run?
* Why are Generics are used in Java?
* Can you mention the design patterns you know? Which of those do you normally use?
* Can you mention some types of testing you know?
Senior
* How does Integer.parseInt() works?
* Do you know what is the “double check locking” problem?
* Do you know the difference between StringBuffer and StringBuilder?
* How is a StringBuilder implemented to avoid the immutable string allocation problem?
* What does Class.forName method do?
* What is Autoboxing and Unboxing?
* What’s the difference between an Enumeration and an Iterator?
* What is the difference between fail-fast and fail safe in Java?
* What is PermGen in Java?
* What is a Java priority queue?
* *s performance influenced by using the same number in different types: Int, Double and Float?
* What is the Java Heap?
* What is daemon thread?
* Can a dead thread be restarted?
Source:- NextLevelCoder
Write Answer This Questions
What are the different Applications of Java?
Mobile Applications
Desktop GUI
Web-based Applications
Enterprise Applications
Scientific Applications
Gaming Applications
Big Data technologies
Business Applications
Distributed Applications
Cloud-based Applications
_Operating System RoadMap
|
|-- Kernel
| |-- Memory Management
| | |-- Paging
| | |-- Segmentation
| | |-- Virtual Memory
| |
| |-- Process Management
| | |-- Process Scheduling
| | |-- Inter-Process Communication (IPC)
| | |-- Threads
| |
| |-- File System
| | |-- File I/O
| | |-- Directory Structure
| | |-- File Permissions
| |
| |-- Device Drivers
| | |-- Communication with Hardware
| | |-- Input/Output (I/O)
| |
| |-- System Calls
| |-- Interface to Kernel Functionality
| |-- Examples: open(), read(), write(), etc.
|
|-- Memory Management
| |-- RAM
| | |-- Stack
| | |-- Heap
| | |-- Data Segment
| | |-- Code Segment
| |
| |-- Cache
| | |-- L1, L2, L3 Caches
| |
| |-- Virtual Memory
| |-- Page Table
| |-- Page Replacement Algorithms
| |-- Swapping
|
|-- File System
| |-- File Organization
| |-- File Allocation Table (FAT)
| |-- Inodes
| |-- File Access Methods
|
|-- Networking
| |-- TCP/IP
| |-- Protocols
| |-- Network Stack
| |-- Routing
| |-- Firewalls
|
|-- Security
| |-- Authentication
| |-- Authorization
| |-- Encryption
| |-- Access Control Lists (ACL)
|
|-- Process Management
| |-- PCB (Process Control Block)
| |-- Context Switching
| |-- Deadlocks
| |-- Synchronization
| |-- Mutual Exclusion
|
|-- Device Management
| |-- I/O Buffering
| |-- Device Controllers
| |-- Interrupt Handling
| |-- DMA (Direct Memory Access)
|
|-- User Interface
| |-- Graphical User Interface (GUI)
| |-- Command Line Interface (CLI)
| |-- Windowing Systems
|
|-- Shell
| |-- Command Interpreter
| |-- Scripting
| |-- Job Control
|
|-- System Utilities
| |-- Task Manager
| |-- Disk Cleanup
| |-- System Monitor
| |-- Backup and Restore
|
|-- Boot Process
| |-- BIOS/UEFI
| |-- Boot Loader
| |-- Kernel Initialization
| |-- Init Process
|
|-- System Libraries
| |-- Standard C Library
| |-- POSIX Library
| |-- WinAPI (for Windows)
|
|-- System Calls
| |-- File System Calls
| |-- Process Control Calls
| |-- Memory Management Calls
| |-- Communication Calls
|
|-- Error Handling
| |-- Error Codes
| |-- Logging
| |-- Recovery Strategies
|
|-- Distributed Systems
| |-- Clustering
| |-- Load Balancing
| |-- Distributed File Systems
|
|-- Cloud Computing
| |-- Virtualization
| |-- Infrastructure as a Service (IaaS)
| |-- Platform as a Service (PaaS)
| |-- Software as a Service (SaaS)
|
└-- Comments
|-- // Single-line comment
└-- /* Multi-line comment */
Complete DSA Roadmap
|-- Basic_Data_Structures
| |-- Arrays
| |-- Strings
| |-- Linked_Lists
| |-- Stacks
| └─ Queues
|
|-- Advanced_Data_Structures
| |-- Trees
| | |-- Binary_Trees
| | |-- Binary_Search_Trees
| | |-- AVL_Trees
| | └─ B-Trees
| |
| |-- Graphs
| | |-- Graph_Representation
| | | |- Adjacency_Matrix
| | | └ Adjacency_List
| | |
| | |-- Depth-First_Search
| | |-- Breadth-First_Search
| | |-- Shortest_Path_Algorithms
| | | |- Dijkstra's_Algorithm
| | | └ Bellman-Ford_Algorithm
| | |
| | └─ Minimum_Spanning_Tree
| | |- Prim's_Algorithm
| | └ Kruskal's_Algorithm
| |
| |-- Heaps
| | |-- Min_Heap
| | |-- Max_Heap
| | └─ Heap_Sort
| |
| |-- Hash_Tables
| |-- Disjoint_Set_Union
| |-- Trie
| |-- Segment_Tree
| └─ Fenwick_Tree
|
|-- Algorithmic_Paradigms
| |-- Brute_Force
| |-- Divide_and_Conquer
| |-- Greedy_Algorithms
| |-- Dynamic_Programming
| |-- Backtracking
| |-- Sliding_Window_Technique
| |-- Two_Pointer_Technique
| └─ Divide_and_Conquer_Optimization
| |-- Merge_Sort_Tree
| └─ Persistent_Segment_Tree
|
|-- Searching_Algorithms
| |-- Linear_Search
| |-- Binary_Search
| |-- Depth-First_Search
| └─ Breadth-First_Search
|
|-- Sorting_Algorithms
| |-- Bubble_Sort
| |-- Selection_Sort
| |-- Insertion_Sort
| |-- Merge_Sort
| |-- Quick_Sort
| └─ Heap_Sort
|
|-- Graph_Algorithms
| |-- Depth-First_Search
| |-- Breadth-First_Search
| |-- Topological_Sort
| |-- Strongly_Connected_Components
| └─ Articulation_Points_and_Bridges
|
|-- Dynamic_Programming
| |-- Introduction_to_DP
| |-- Fibonacci_Series_using_DP
| |-- Longest_Common_Subsequence
| |-- Longest_Increasing_Subsequence
| |-- Knapsack_Problem
| |-- Matrix_Chain_Multiplication
| └─ Dynamic_Programming_on_Trees
|
|-- Mathematical_and_Bit_Manipulation_Algorithms
| |-- Prime_Numbers_and_Sieve_of_Eratosthenes
| |-- Greatest_Common_Divisor
| |-- Least_Common_Multiple
| |-- Modular_Arithmetic
| └─ Bit_Manipulation_Tricks
|
|-- Advanced_Topics
| |-- Trie-based_Algorithms
| | |-- Auto-completion
| | └─ Spell_Checker
| |
| |-- Suffix_Trees_and_Arrays
| |-- Computational_Geometry
| |-- Number_Theory
| | |-- Euler's_Totient_Function
| | └─ Mobius_Function
| |
| └─ String_Algorithms
| |-- KMP_Algorithm
| └─ Rabin-Karp_Algorithm
|
|-- OnlinePlatforms
| |-- LeetCode
| |-- HackerRank
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for Coders & Engineers
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➡️Develop and implement machine learning algorithms and models.
➡️Work on projects related to artificial intelligence and data science.
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➡️Possess proficiency in both front-end and back-end development.
➡️Work on end-to-end development of web applications.
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💟Placement Material - TCS
https://drive.google.com/drive/u/0/folders/1I8QqnzZonRewbSnUMyfC9-tRduEJ4gyB
💟Placement Material - Zenpact
https://drive.google.com/drive/u/0/folders/1xWFAJguXXuvjRKYB5aWBiyrftCxxozK-
💟Placement Material - Audi Time
https://drive.google.com/drive/u/0/folders/1oiJn-YcJwZ7_UQ_keW6qA3-GUW19sK6Q
💟Placement Material - TEK system
https://drive.google.com/drive/u/0/folders/1cgUttmyCZcFsqqk8uKZVSV_qi7oe32Ov
💟Placement Material - Cocubes
https://drive.google.com/drive/u/0/folders/17iQT-S9qT0HUyA-Ks1QDJs_cTBZp5gGN
💟 Infosys, Accenture, HCL -> https://bit.ly/NextLevel-AI
*Here are some very useful resources for you*
*AI Related Resources*
https://drive.google.com/drive/folders/1hbLmmLDA78Y6JdEegaa4muEHHSaKlzvu
*.Net Framework Related*
https://drive.google.com/drive/folders/1ndgmflQ0iMzgvN9j8GdFaOvoM4tISIC7
*API's Related*
https://drive.google.com/drive/folders/16H6x_uvhRboGHuSRz_pFmKY_Jyu0dUYc
*Aptitude Related*
https://drive.google.com/drive/folders/1OzC2r1yM49Vy7wmp5o8sLFdLKmaDie6r
*Big Data/Data Engineering/Big data Analytics Related*
https://drive.google.com/drive/folders/1P86FmX89RoNwBDQwPQQqrHx8IKRrDam8
*C# Related*
https://drive.google.com/drive/folders/1J_980RyoO2oFq1XVytKQ44Va9JPSiV9r
*Coding Related*
https://drive.google.com/drive/folders/18PFsNFXs-4MGMQsmUm2YNJOgU7y784-R
*Computer Network Related*
https://drive.google.com/drive/folders/10x2VhWS3eopYhrQ2EC8NcEWNLkMT4Xx0
*Data Analyst Related*
https://drive.google.com/drive/folders/1OWSla1P0TIq2no9-twxLWIhjQlQ_J3LP
*Data Science Related*
https://drive.google.com/drive/folders/1uK_tbGYKPoLOMzP65rpuafTjm1kBblJZ
*DBMS Related*
https://drive.google.com/drive/folders/1tjhXqUZGldCfYgjIXrvH-JqzQbMgOIZp
*Django Related*
https://drive.google.com/drive/folders/1P-5QwhvB43PiXqTJHvQDdbEMh3Ny824X
*DSA Related*
https://drive.google.com/drive/folders/1lniVxTGpPsq-0KWJx-zPqP3NyNyRarN3
*Excel Related*
https://drive.google.com/drive/folders/1yNN6Ir9FiqYOYeTzUj2bhkv8H-sZFny8
*Flask Related*
https://drive.google.com/drive/folders/1F0gHU81wjEF-KRx790Y-Wzyu2qCuyvN0
*Git, GitHub,Gitlab*
https://drive.google.com/drive/folders/1FfYAbCN8-4mkoZUDUzSIaMcl8mQe4rX4
*Hibernate Related*
https://drive.google.com/drive/folders/1smsMPkm8xtgcpT239C2pNmXdienZUqtn
*Html and CSS Related*
https://drive.google.com/drive/folders/1pBwgUVffHIRAg8xsKQVpC7bixPCj_zqZ
*Interview Preparation Related*
https://drive.google.com/drive/folders/1SqEoYvIy4iLi08GN7XJHdEi85WKYFww4
*Javascript Related*
https://drive.google.com/drive/folders/1leTy7BAsowgHlrOa-_HV-10GLOQ8NPe5
*Java Related*
https://drive.google.com/drive/folders/1n8pIF8X0t_-uGNMLtoee-k_QOgK1G6Lw
*Machine Learning Related*
https://drive.google.com/drive/folders/1uDRIEPlQWZXrJr8LPC9V8sBs3-6gwbzq
*Mongo DB Related*
https://drive.google.com/drive/folders/1N6DpbUs1ajOxuWkjnt1_1epGpWrDxdQq
*Node JS Related*
https://drive.google.com/drive/folders/17FNp1EBdZbUwcRQarvaSIvqpJ8wJrLB4
*OOPs Related*
https://drive.google.com/drive/folders/14nC1PK3_fSbF7la0U5jpK2zPSiAGajk4
*OS Related*
https://drive.google.com/drive/folders/1mNWn7rsQRecatIKAcJ5fLYMRrsrRe9Kv
*Project Ideas Related*
https://drive.google.com/drive/folders/17L4Kkk0MNNMWcOtZjHh7qthfO5dbhU2s
*Python Related*
https://drive.google.com/drive/folders/1F9n10ZcmN3OZ_bNCOmULWwzw7y9bigtU
*React JS Related*
https://drive.google.com/drive/folders/1EAE9iAxvEf3Gu_tdd5LTX-LYoliNcPl0
*Software Engineering and SDLC Related*
https://drive.google.com/drive/folders/1OsqKfjFN2j-Lp4PfPAVQbfSEyGfyGDvg
*Spring Boot Related*
https://drive.google.com/drive/folders/1-3F58_6Bls2i7pI95yBMB2BdjCpBxXQM
*Spring Related*
https://drive.google.com/drive/folders/1piKKtOd_5ucwfVa8RgeCctz9WojOvcyo
*SQL Related*
https://drive.google.com/drive/folders/1mc-aFFiW75wAMpHaakmdhCVV4IzqgGWK
Hope you find these resources helpful. If you enjoy the content, please react and share. Happy learning! 🚀🤝🏻
🔴 Company:- 9 Company ( GeeksforGeeks, Dovelp,LYBL,Pulse,Parkmate ) is hiring
Exam Date: 10 OCT 2023
Job Role :- Software Engineer,Full Stack, Salesforce,Devops,Angular Developer,MERN,NodeJS Developer
Experienced Required : - 1 to 6 years
Eligibility : All Degree Eligible
Salary Range :- 7 to 20LPA+ (Depend upon Experience)
Job Location - Pan in India
Telegram:- https://t.me/nextlevelcoders
Instagram Job Page:https://instagram.com/next.levelcoder?igshid=MzMyNGUyNmU2YQ==
❗️ Apply Link : https://bit.ly/3tapWAm
