Java Quizzes (MCQs)

Level 1 The Fundamentals Syntax & Control Flow
Java Basics JDK, JVM, Variables, Primitives
01_CORE 
Operators & Loops Arithmetic, If-Else, Switch, For, While
02_LOGIC 
Arrays & Strings Multi-dim Arrays, Immutability, StringBuilder
03_DATA 
Level 2 OOP Principles Structure & Design
Classes & Objects Constructors, 'this', Access Modifiers
04_CLASS 
Inheritance & Poly extends, super, Overriding vs Overloading
05_EXTEND 
Abstraction Interfaces, Abstract Classes, Get/Set
06_OOD 
Statics & Finals Static context, Constant classes
07_MODS 
Level 3 Core APIs Professional Toolset
Exceptions Try-Catch, Custom Exceptions, Resources
08_ERROR 
Collections List, Set, Map, Iterators
09_COLL 
Generics Type Erasure, Wildcards, Generic Classes
10_GEN 
I/O & Streams Byte/Char Streams, Serialization
11_IO 
Level 4 Advanced Core Efficiency & Modern Java
Concurrency Threads, Synchronization, Thread Pools
12_SYNC 
Functional Lambdas, Functional Interfaces
13_LAMBDA 
Streams API Filters, Maps, Parallel Streams
14_STRM 
Memory Heap vs Stack, Garbage Collection
15_MEM 
Level 5 Enterprise Connections & Architecture
JDBC PreparedStatements, ResultSets
16_DB 
Reflection Custom Annotations, Runtime Inspect
17_META 
Java Modules module-info, JPMS Exports
18_MODS 
Level 6 Frameworks Ecosystem & Tooling
Unit Testing JUnit 5, Mockito, Assertions
19_TEST 
Spring Boot DI, IoC, Autowiring
20_SPR 
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