CTC 15+ LPA Infosys Java Developer Interview Questions & Answer | Infosys 3 Years Java Experience

Top 30 Java Interview Questions & Answers for Infosys (3+ Years Experience) | Core Java Interview Preparation

Are you preparing for Infosys, TCS, Wipro, Accenture, or any Java Developer interview for 3+ years experience?
This video covers the MOST ASKED Core Java Interview Questions that companies repeatedly ask during real interviews — with examples and clear explanations.

▶️Java Developer Interview Question Playlist: https://www.youtube.com/playlist?list=PLSca82_CRlvo9628twAjCn-jX5CI5IGFd

In this video, we will cover 30 high-quality Java interview questions every developer must know:

💡 Covered in This Video

Here are the 30 Java Interview Questions & Answers included:

Difference between JDK, JRE, JVM

Features introduced in Java 8

HashMap vs ConcurrentHashMap

Fail-fast vs Fail-safe iterators

How Java memory management works

Types of references in Java (Strong, Weak, Soft, Phantom)

String vs StringBuilder vs StringBuffer

throw vs throws

Why String is immutable

What is a functional interface

What is Stream API & advantages

What is Optional and why is it used

Comparator vs Comparable

What is ClassLoader

Common memory leak scenarios in Java

What is volatile keyword

What is synchronized keyword

What is thread safety

Difference between process and thread

What is ExecutorService & thread pools

What is deadlock

What is an immutable class

What is serialization

What is transient keyword

Abstract class vs Interface

final vs finally vs finalize()

Java parallel streams

Singleton design pattern

Checked vs unchecked exceptions

Garbage Collection & phases

🎯 Who Should Watch This Video?

Java Developers with 3–5 years experience

Freshers preparing for Infosys SE/SE Specialist rounds

Anyone revising Core Java for interviews

Students preparing for campus placements

Professionals attending service-based company interviews

🔥 Why This Video Is Valuable

✔ Infosys-style questions
✔ Real project-level examples
✔ Clear & easy explanations
✔ Covers the most frequently asked Java concepts
✔ Helps you prepare confidently for your next interview

✨ If You Found This Useful

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Видео CTC 15+ LPA Infosys Java Developer Interview Questions & Answer | Infosys 3 Years Java Experience канала Dip Developer