JAVA Interview Questions and Answers in 2025 (100+ Q&A)

JAVA Team Lead/ Tech Lead

Ques:- I have a String name & Map m, in my bean class. I have get & set methods on both.To Display the String name, i doThe above one works fine.Te below one, displays the entire Map contentsI know the KEY, how do i display the VALUE for that KEY

Asked In :- palo it, crest infosystems pvt. ltd.,

JAVA Team Lead/ Tech Lead

Ques:- What is native method

Asked In :- epra,

JAVA Team Lead/ Tech Lead

Ques:- Given a text file, input.txt, provide the statement required to open this file with the appropriate I/O

Asked In :- Triad Software, TechnoGen, SiriusXM,

JAVA Team Lead/ Tech Lead

Ques:- What is the Difference between sendRedirect() and Forward?

Asked In :- GO Outdoors, velan info services,

JAVA Team Lead/ Tech Lead

Ques:- What happens when a thread cannot acquire a lock on an object?

Asked In :-

JAVA Team Lead/ Tech Lead

Ques:- What class is the top of the AWT event hierarchy?

Asked In :- Sciative Solutions,

JAVA System Administrator

Ques:- Write a simple bean program?

Asked In :- Codelogicx Technologies, ZeMoSo, iceye, kalycito,

JAVA System Security Engineer

Ques:- What is a refferent?

Asked In :- JNET Technologies, ACS IT SOLUTIONS, Amshuhu, vmware airwatch,

JAVA Team Lead/ Tech Lead

Ques:- It is essential to catch all types of exceptions

Asked In :- Mobio Solutions, SSA, ascent software,

JAVA System Integrator

Ques:- If two overloaded methods are-Test(Object xyz) and test(Customer cust)[Assume Customer is a class with member name of type String].Now if we call test(null), which method will be called? why?

Asked In :- Swabhav Techlabs Solutions,

JAVA System Security Engineer

Ques:- How to swap 2 variables without using third temp variable in java?

Asked In :- Pennant Technologies, mediatek, lera technologies,

JAVA System Integrator

Ques:- What is the difference between throw and throws?

Asked In :- ste,

JAVA Team Lead/ Tech Lead

Ques:- For what purpose java language is named as java?

Asked In :- canonical ltd., rolustech,

JAVA Team Lead/ Tech Lead

Ques:- Write a program on RMI and JDBC using Stored Procedure?

Asked In :- Amrut Software, jb hi-fi,

JAVA System Administrator

Ques:- What is the difference between putting a class as abstract or if any of method in class is declared as abstract diference of these two while extending these two types of classes

Asked In :- Volansys, Ideal IT,

JAVA System Administrator

Ques:- Like Object class is inherited by every class, means every class that you define in java is implicitely extending one class that is Object. Similarly i want to know that which interface is implicitely implemented by every class that we define.

Asked In :- Priya Softweb Solutions, BridgeLabz Solutions, sienna senior living, servicetitan,

JAVA System Security Engineer

Ques:- In overriding, the super class method throws I/O exception & in sub class that method throws arithmetic exception. what happens?

Asked In :- Cron-J, KeyValue Software Systems, crowdstrike, phenom people, 6sense,

JAVA System Integrator

Ques:- What is difference between runnable and thread ?

Asked In :- KRL, cdit,

JAVA Team Lead/ Tech Lead

Ques:- What is meant by class loader. How many types are there. When will we use them?

Asked In :- Gainers Infotech, Surya Software, CG-VAK Software (India), kaleyra,

JAVA System Integrator

Ques:- Which class is the super class for all classes in java.lang package?

Asked In :- Tecnotree, mitratech, uvj technologies pvt.ltd - india,

The Java skill section on takluu.com is designed for freshers, intermediate developers, and experienced professionals aiming to crack Java-based technical interviews with confidence. Java remains one of the most in-demand programming languages, and mastering it opens the door to countless opportunities in backend development, enterprise solutions, Android apps, and cloud-based platforms.

Our Java category covers everything from Core Java concepts like OOPs (Object-Oriented Programming), Data Types, Loops, and Exception Handling to Advanced Java topics including Collections Framework, Multithreading, JDBC, Servlets, JSP, Lambda Expressions, and Streams. We provide practical coding examples, real interview questions (with answers), and key concept explanations that interviewers commonly test.

Whether you’re applying for a role like Java Developer, Backend Engineer, or Full Stack Developer, this section ensures you understand the logic, syntax, and problem-solving approaches that matter in real-world interviews. You’ll also find scenario-based questions and discussions around design patterns, JVM internals, garbage collection, and performance tuning — areas often explored in senior-level interviews.

Each topic is structured to help you revise quickly and efficiently, with quizzes and mock interviews to assess your understanding. Our content is curated by experts who have worked with Java across different domains and keep the material aligned with current industry trends.

At Takluu, we believe in not just learning Java — but preparing to think in Java. Get ready to face interviews with clarity, confidence, and a deep understanding of what makes Java so powerful and reliable.

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