Java Coding Course

Lesson 1 • Console Input and Output

Read user input with Scanner and print results with System.out. Enables interactive programs used throughout the course.

Lesson 2 • Primitive Data Types and Variables

Declare and initialize variables using Java's eight primitive types. Connects type selection to memory efficiency and correctness.

Lesson 3 • Installing the Java Development Kit

Configure JDK, set PATH variables, and verify installation. Establishes the toolchain every subsequent chapter depends on.

Lesson 4 • Structure of a Java Program

Examine the anatomy of a Java source file: package declarations, imports, class body, and the main method. Provides the template used in every coding exercise.

Lesson 1 • Conditional Statements

Use if, else-if, and else blocks to branch program logic. Lays the decision-making foundation required by every subsequent algorithm.

Lesson 2 • Loop Constructs

Repeat code blocks with while, do-while, and for loops. Iteration is the core mechanism behind data processing in later chapters.

Lesson 3 • Nested Loops and Pattern Problems

Combine multiple loops to solve two-dimensional problems such as matrix traversal and pattern printing. Builds algorithmic thinking for array chapters.

Lesson 4 • Switch Statements and Expressions

Select among multiple execution paths using switch. Introduces modern switch expressions available in recent Java versions.

Lesson 1 • Variable Scope and Method Design

Manage local, block, and class-level scope to write predictable methods. Good scope discipline reduces bugs in multi-method programs.

Lesson 2 • Method Overloading

Define multiple methods with the same name but different parameter lists. Demonstrates compile-time polymorphism used throughout the Java API.

Lesson 3 • Recursion Fundamentals

Solve problems by having methods call themselves with a base case. Recursion underpins tree traversal and divide-and-conquer algorithms covered later.

Lesson 4 • Defining and Calling Methods

Write static methods with parameters and return types. Establishes the modular structure that object-oriented design extends in later chapters.

Lesson 1 • Multidimensional Arrays

Create and navigate two-dimensional and jagged arrays. Enables matrix operations and grid-based problem solving.

Lesson 2 • Sorting and Searching Arrays

Implement bubble sort, selection sort, and binary search on arrays. Builds algorithmic intuition before the Collections Framework chapter.

Lesson 3 • StringBuilder for Efficient Text Building

Use StringBuilder to build strings in loops without excessive object creation. Directly addresses performance issues caused by string concatenation.

Lesson 4 • String Class and Common Methods

Manipulate text using String methods such as substring, split, and replace. String processing is essential for file I/O and API integration.

Lesson 1 • The Object Class and toString

Override toString, equals, and hashCode from the root Object class. Correct overrides are required for collections and debugging.

Lesson 2 • Encapsulation and Access Modifiers

Protect fields with private access and expose them through getters and setters. Encapsulation enforces invariants and reduces coupling.

Lesson 3 • Classes and Objects

Define classes with fields and methods, then instantiate objects. Shifts thinking from procedural to object-oriented design.

Lesson 4 • Static Members and Utility Classes

Use static fields and methods for shared state and utility functions. Clarifies when class-level vs. instance-level members are appropriate.

Lesson 1 • Inheritance and the extends Keyword

Create subclasses that inherit fields and methods from a superclass. Inheritance reduces duplication and models is-a relationships.

Lesson 2 • Casting and Type Checking

Safely cast between types and verify type identity at runtime. Prevents ClassCastException in polymorphic code.

Lesson 3 • Interfaces and Multiple Type Contracts

Declare interfaces to specify behavior contracts independent of class hierarchy. Interfaces enable multiple-type conformance and loose coupling.

Lesson 4 • Abstract Classes and Methods

Define abstract classes that enforce a contract without full implementation. Abstract types model incomplete concepts that subclasses must complete.

Lesson 1 • try-catch-finally Blocks

Wrap risky code in try blocks and recover in catch blocks. finally ensures cleanup code always executes regardless of outcome.

Lesson 2 • Exception Hierarchy and Types

Navigate Java's exception hierarchy: Throwable, Error, and Exception subtypes. Understanding the hierarchy determines which exceptions to catch or declare.

Lesson 3 • Throwing and Declaring Exceptions

Use throw to signal errors and throws to declare checked exceptions. Proper declaration forces callers to handle or propagate errors.

Lesson 4 • Custom Exception Classes

Create domain-specific exception types by extending Exception or RuntimeException. Custom exceptions carry meaningful context for callers.

Lesson 1 • Collections Utility Methods and Sorting

Use the Collections class and Comparator to sort, shuffle, and search collections. Comparator-based sorting is essential for custom ordering requirements.

Lesson 2 • Queue, Deque, and Stack Operations

Process elements in FIFO and LIFO order using Queue and Deque. These structures underpin scheduling, parsing, and graph algorithms.

Lesson 3 • Generics and Type Safety

Parameterize classes and methods with type variables to eliminate unsafe casts. Generics are the foundation of the entire Collections Framework.

Lesson 4 • List Interface and Implementations

Store ordered, index-accessible elements with ArrayList and LinkedList. Lists are the most commonly used collection type in Java applications.