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Courses/Java Intermediate: Collections, Streams & Modern OOP
INTERMEDIATE Track•Java 21

Java Intermediate: Collections, Streams & Modern OOP

Level Up: Master Collections, Streams, Multithreading, Modern Records, and Relational DBs.

Modules10
Lessons20
Quizzes4
Free Previews2 Free

Course Overview

Designed for developers who know basic Java syntax and are ready to write production-grade, elegant, high-performance backend systems. Master the full Collections Framework, Streams API, Concurrency, Modern Records, and Relational Database persistence with bite-sized, practical lessons.

What You Will Master

• Master the Java Collections Framework (List, Set, Map, Deque) with Big-O complexity analysis. • Write declarative, functional pipeline code using Java Streams and Collectors. • Leverage Java 21 features: Records, Sealed Classes, and Pattern Matching. • Build multi-threaded applications using ExecutorService and thread-safe collections. • Connect Java applications to relational databases using JDBC, connection pools, and transactions.

Prerequisites

Core Java syntax, variables, basic OOP (classes and objects), loops, and method definitions.

Full Course Syllabus

Every module and lesson topic is visible upfront. Open free sample lessons immediately.

1.1 Deep Dive: Generics, Invariance & Type Bounds

Write generic classes and bounded type parameters to eliminate ClassCastException bugs at compile-time.

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1.2 Wildcards & The PECS Rule in Practice

Master Upper-bounded (`? extends T`) and Lower-bounded (`? super T`) wildcards using Joshua Bloch's PECS rule.

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Module 1 Checkpoint: Collections & Generics
Checkpoint Quiz
2.1 ArrayList vs LinkedList Internals & Dynamic Resizing

Analyze contiguous memory arrays, 50% growth reallocation, CPU cache lines, and why LinkedList is rarely optimal.

Topic Outline
2.2 HashSet Hashing & The equals/hashCode Contract

Learn how HashSet leverages HashMap under the hood, why overriding equals() requires hashCode(), and how to avoid memory leaks.

Topic Outline
Checkpoint: Collections, Lists & Sets
Checkpoint Quiz
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In-lesson Java sandbox & checkpoint quizzes
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