Build your Java foundation

01

Java Introduction

Start with Java’s history, platform independence, JVM architecture, JDK tools, syntax, variables, data types, operators, decisions, and loops. Build a strong foundation by writing and running your first practical Java programs.

→ 02

Methods

Learn how methods organize application behavior into small reusable units. Practice declarations, parameters, arguments, return values, scope, overloading, recursion, varargs, and clean method design with useful examples.

→ 03

Arrays

Store and process fixed-size groups of values using Java arrays. Learn indexing, traversal, searching, sorting, copying, multidimensional arrays, common mistakes, and practical algorithms for working with collections of data.

→ 04

Strings

Work confidently with text using String, StringBuilder, and StringBuffer. Explore immutability, comparison, searching, slicing, formatting, conversion, regular operations, and efficient techniques for real application input and output.

→ 05

Object-Oriented Programming

Understand how Java models real systems with classes and objects. Build practical knowledge of constructors, encapsulation, inheritance, polymorphism, abstraction, composition, and maintainable object-oriented design through clear examples.

→ 06

Interfaces

Design flexible contracts between Java components with interfaces. Learn implementation, multiple inheritance of type, default and static methods, functional interfaces, nested interfaces, and how abstraction improves testable application architecture.

→ 07

Marker Interfaces

Understand Serializable, Cloneable, and custom marker interfaces. Learn how marker types communicate metadata to the JVM and frameworks, and when this lightweight design pattern is useful in Java applications.

→ 08

Exception Handling

Make programs reliable when unexpected situations occur. Practice try-catch, finally, throw, throws, checked and unchecked exceptions, custom exception classes, propagation, try-with-resources, and clear error-handling strategies.

→ 09

Regular Expressions

Search and validate structured text with Java regular expressions. Learn patterns, character classes, quantifiers, groups, anchors, Pattern, Matcher, replacement, splitting, and safe validation techniques for common input.

→ 10

Memory Management

Discover how Java stores and manages objects during execution. Explore stack and heap memory, class loading, garbage collection, references, leaks, JVM memory areas, and practical habits for efficient applications.

→ 11

Generics

Write reusable code while keeping compile-time type safety. Understand generic classes, interfaces, methods, bounded type parameters, wildcards, variance, raw types, type erasure, and practical generic collection patterns.

→ 12

Collections

Choose the right data structure for each problem with List, Set, Map, Queue, and Deque. Compare implementations, iterate safely, sort data, use utility methods, and understand performance trade-offs.

→ 13

Java 8+ Features

Modernize your Java style with lambda expressions, functional interfaces, method references, streams, Optional, collectors, and interface improvements. Learn when these features make code clearer and when simplicity matters more.

→ 14

Date & Time API

Handle dates and times correctly with the java.time package. Work with LocalDate, LocalDateTime, Instant, zones, formatting, parsing, durations, periods, comparisons, and reliable time-based application logic.

→ 15

Multithreading

Build responsive and concurrent Java programs with threads and executors. Understand synchronization, race conditions, locks, coordination, thread pools, futures, safe shared state, and practical concurrency design.

→ 16

File Handling

Read, write, copy, move, and manage files with Java IO and NIO. Practice streams, readers, writers, Paths, Files, directories, metadata, buffering, character encoding, and safe resource handling.

→ 17

JDBC

Connect Java applications to relational databases using JDBC. Learn drivers, connections, prepared statements, queries, ResultSet processing, transactions, resource cleanup, and safe database access patterns.

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