Java Streams API: The Complete Guide for 2025
A comprehensive Java course built from a practitioner's masterdoc. From core language to Spring Boot, DSA, system design, and production deployments.
One-time payment · Lifetime access · PDF downloads
public class Main { public static void main(String[] args) { // Your Java journey starts here List<String> skills = new ArrayList<>(); skills.add("Core Java"); skills.add("Spring Boot"); skills.add("System Design"); skills.add("DSA in Java"); skills.forEach( System.out::println ); } }
OOP, data types, control flow, generics, exceptions, I/O, threading — everything from the ground up.
Build production-grade REST APIs, understand IoC/DI, Spring Security, JPA, Hibernate and microservices.
Arrays, LinkedLists, Trees, Graphs, Sorting, Dynamic Programming — all with Java implementations.
SQL fundamentals, JPA/Hibernate ORM, query optimization, connection pooling, transactions.
Design patterns, SOLID principles, clean architecture, scalable system design for interviews.
Docker, CI/CD, AWS basics, logging with SLF4J, monitoring, Maven/Gradle build tools.
Data types, variables, type casting, operators, strings, String methods, StringBuilder, printf formatting. Includes Cheat Sheet PDF.
if/else, ternary, for/while/do-while loops, enhanced for, switch expressions (Java 14+), break, continue, labeled loops.
Classes & objects, constructors, encapsulation, inheritance, method overriding, abstract classes, interfaces, polymorphism, inner classes.
List, Set, Map, Queue — ArrayList, LinkedList, HashMap, TreeMap, HashSet, PriorityQueue. Comparators, Iterators, Collections utility class.
Generics deep-dive, functional interfaces, lambda expressions, method references, Stream API — filter/map/reduce/collect, Optional, parallel streams.
Checked vs unchecked, try-catch-finally, multi-catch, try-with-resources, custom exceptions. File I/O with NIO.2, BufferedReader, serialization.
Threads, Runnable, Callable, ExecutorService, synchronized, volatile, locks, CompletableFuture, virtual threads (Java 21).
Big-O analysis, arrays, linked lists, stacks, queues, trees (BST, AVL), heaps, graphs (BFS/DFS), sorting algorithms, dynamic programming patterns. Includes DSA Reference PDF.
Spring IoC, beans, DI, auto-configuration, building REST APIs, validation, error handling, Spring Data JPA, H2/PostgreSQL, DTOs, MapStruct.
Spring Security, JWT auth, JUnit 5, Mockito, integration tests, Maven & Gradle, dependency management, profiles, configuration.
Relational modeling, SQL deep dive, JPQL vs native queries, N+1 problem, fetch strategies, indexing, transactions, database migrations (Flyway).
Design patterns (GoF), SOLID principles, microservices architecture, Docker, Docker Compose, CI/CD with GitHub Actions, AWS EC2/RDS basics.
This course grew from a personal Notion masterdoc — a living reference built while working on production Java systems. Every concept is battle-tested, every example is real.
"I wrote this because I wanted one document I could reference for everything Java. Then it became too good not to share."Join the course →
"The Stream API module alone was worth the price. Finally explained in a way that actually made sense — with real examples, not toy code."
"I used this as interview prep. The DSA module with Java implementations + the cheat sheet PDF got me through 3 rounds at a FAANG company."
"The Spring Boot section is extremely practical. Within a week I had a full REST API with JWT auth running in production. Incredible value at ₹999."