Technical · Structured skill path
Java Track Assessment & Practice
Practical Java for backend and data engineers from language fundamentals to interview problem solving.
20 progressive levels · Beginner → advanced · 400 published questions
Start with the FREE entry level. PRO levels remain gated and unlock in sequence after sign-in.
Level 1
Java Syntax & Fundamentals
Java Syntax & Fundamentals Assessment
beginner · 20 published questions
Level 2
Data Types & Type Conversion
Java Data Types & Type Conversion Assessment
beginner · 20 published questions
Level 3
Control Flow
Java Control Flow Assessment
beginner · 20 published questions
Level 4
Methods & Parameter Passing
Java Methods & Parameter Passing Assessment
beginner · 20 published questions
Level 5
Classes, Objects & Encapsulation
Java Classes, Objects & Encapsulation Assessment
beginner · 20 published questions
Level 6
Inheritance & Polymorphism
Java Inheritance & Polymorphism Assessment
intermediate · 20 published questions
Level 7
Interfaces & Abstract Classes
Java Interfaces & Abstract Classes Assessment
intermediate · 20 published questions
Level 8
Collections Framework
Java Collections Framework Assessment
intermediate · 20 published questions
Level 9
Generics
Java Generics Assessment
intermediate · 20 published questions
Level 10
Exceptions
Java Exceptions Assessment
intermediate · 20 published questions
Level 11
Strings & Value Objects
Java Strings & Value Objects Assessment
intermediate · 20 published questions
Level 12
Lambdas & Streams
Java Lambdas & Streams Assessment
intermediate · 20 published questions
Level 13
I/O & File Processing
Java I/O & File Processing Assessment
intermediate · 20 published questions
Level 14
Testing & Maintainable Code
Java Testing & Maintainable Code Assessment
intermediate · 20 published questions
Level 15
Concurrency Fundamentals
Java Concurrency Fundamentals Assessment
advanced · 20 published questions
Level 16
Concurrent Collections & Async Design
Java Concurrent Collections & Async Design Assessment
advanced · 20 published questions
Level 17
JVM, Memory & Garbage Collection
Java JVM, Memory & Garbage Collection Assessment
advanced · 20 published questions
Level 18
Performance Engineering
Java Performance Engineering Assessment
advanced · 20 published questions
Level 19
Production Java Design
Java Production Java Design Assessment
advanced · 20 published questions
Level 20
Advanced Java Problem Solving
Java Advanced Java Problem Solving Assessment
advanced · 20 published questions