Java Programming Course: Core Java to Spring Boot Basics

Install the JDK and write Java programs that read input and print results.

• What Java is and where it is used
• JDK, JRE and JVM: how Java code runs
• Installing a current long-term-support JDK and IntelliJ IDEA Community Edition
• Your first Java program and the main method
• Data types, variables and type casting
• Input with Scanner and output with System.out

JDKIntelliJ IDEA Community EditionVS Code (optional)

Practice: Simple calculator · Swap two variables · Fahrenheit-Celsius converter

Write logic-driven programs with operators, conditions and loops.

• Arithmetic, logical, relational and bitwise operators
• if, if-else, switch and the ternary operator
• for, while and do-while loops
• break, continue and labelled loops

Practice: Prime number checker · Pattern printing programs · Palindrome number checker

Model problems with classes and objects using Java's four OOP pillars.

• Classes, objects and constructors
• The this, super and final keywords
• Encapsulation and access modifiers
• Inheritance and method overriding
• Polymorphism: overloading and overriding
• Abstraction: abstract classes vs interfaces

Practice: Bank account class · Animal and Dog inheritance model · Shape polymorphism example

Handle lists of values and text efficiently.

• 1D and 2D arrays, traversal and sorting
• String, StringBuilder and StringBuffer
• Common string methods
• Why strings are immutable, and the string pool

Practice: Reverse a string · Count vowels and consonants · Matrix multiplication

Make programs fault-tolerant and read or write data in files.

• Checked vs unchecked exceptions
• try, catch, finally, throw and throws
• Custom exceptions and exception propagation
• Reading and writing files with BufferedReader, BufferedWriter and java.nio.file
• try-with-resources
• Serialization basics

Practice: Age validation with a custom exception · Copy one file to another · Read a CSV and print a table

Use Java's built-in data structures and write type-safe generic code.

• Generics and why they matter
• List, Set, Map and Queue interfaces
• ArrayList vs LinkedList
• HashSet, TreeSet, HashMap, LinkedHashMap, TreeMap
• Stack, ArrayDeque and PriorityQueue
• Iterators, Comparable and Comparator

Practice: Word frequency counter with HashMap · Sort custom objects with Comparator · Stack and queue programs

Write shorter, clearer code with functional-style Java and newer language features.

• Functional interfaces: Predicate, Function, Consumer, Supplier
• Lambda expressions and method references
• Stream API: filter, map, reduce, collect
• Grouping data with Collectors
• Optional
• Modern features: var, records and switch expressions

Practice: Employee salary report with streams · List filtering with lambdas · Group students by grade

Run tasks in parallel safely and understand common concurrency bugs.

• Creating threads with Thread and Runnable
• Thread lifecycle
• Synchronization and locks
• wait(), notify() and notifyAll()
• Thread pools with ExecutorService
• Deadlocks and how to prevent them

Practice: Producer-consumer problem · Synchronized counter · Thread-safe bank transfer

Understand what happens inside the JVM and apply common design patterns.

• Stack vs heap memory and garbage collection (overview)
• Finding memory leaks with a profiler (introduction)
• Annotations and reflection basics
• Design patterns: Singleton, Factory, Strategy, Observer
• Packages and Java modules (overview)

Practice: Payment system using the Strategy pattern · Notification system using the Observer pattern

Store data in a database from Java and build a first REST API with Spring Boot.

• JDBC: connecting to MySQL or PostgreSQL
• Running SELECT, INSERT, UPDATE and DELETE
• PreparedStatement and protecting against SQL injection
• What Spring Boot is and how dependency injection works
• Building REST APIs with Spring Boot
• CRUD with Spring Data JPA and testing APIs with Postman

MySQLMavenSpring BootSpring Data JPAPostman

Practice: Student database management system · Employee management REST API