Practice all Core Java Mock Tests at One Place For Free

Core Java MCQ Hub

Master Core Java concepts with our topic-wise MCQs for interviews and placements.

💡 Click on any sub-topic label below to start the mock test for that concept.

☕ Core Java MCQs

Java Basics

Data Types & Variables Operators Control Flow Arrays

OOP Concepts

Abstraction Encapsulation Inheritance Polymorphism

Exception Handling

try-catch-finally Checked vs Unchecked Custom Exceptions

Collections Framework

List vs Set vs Map ArrayList vs LinkedList HashMap Internals Concurrent Collections Comparable vs Comparator

Multithreading

Lifecycle Synchronization

I/O Streams

File I/O BufferedReader

Java 8 Features

Lambda Expressions Stream API Functional Interfaces Optional Class Date/Time API

Java 9 Features

Module System (Jigsaw) Factory Methods Private Interface Methods HTTP/2 Client

String Handling

String Pool Concept String vs StringBuilder Immutable Nature

Memory Management

Heap vs Stack Garbage Collection JVM Architecture

Generics

Basics Wildcards

JDBC

Connection Statement