JAVA Programming for Beginners - The Complete Course

Explore variables and data types in Java, including local, instance, and static variables, clarify how class and object relate to these variables, and differentiate primitive and non-primitive types like strings.

Explore the types of operators in Java, including unary and binary operators, relational, equality, logical, and assignment operators, with examples of increment, decrement, shifts, and the ternary conditional.

Learn how to use Java comments to explain code, document functionality, and temporarily disable lines with single-line, multi-line, and documentation comments.

Explore using if statements to execute code when a condition is true, including nested ifs and else blocks, with examples like greater than 100 and even/odd checks.

Learn to use nested if statements and else if blocks to compare numbers, apply conditions, and determine the greatest value in Java.

Learn how switch statements select one case from multiple conditions using case, default, and break, with examples that compare a number to case values.

Learn the for loop syntax with initialization, condition, and increment, and use it and for-each to iterate over arrays or collections, including nested loops and simple console examples.

Learn to take user input in Java with the Scanner class and display it on the console. Explore a for loop with initialization, condition, and update, plus break and continue.

Understand the do-while loop in Java, which executes the loop body at least once and then checks the condition, highlighting how it differs from a while loop.

Explore object oriented programming in Java by examining objects and classes, inheritance, polymorphism, abstraction, encapsulation, and interfaces, and see how modular design enables easier maintenance and real world modeling.

Learn the Java naming conventions that improve readability and code quality by applying camel case for methods and variables, capitalized class and interface names, and uppercase constants.

Objects are entities with state and behavior, uniquely identified by an internal ID, defined by instance variables and methods, with a class as their blueprint.

Learn three ways to initialize an object in Java, with a focus on constructor-based initialization, and practice creating objects from a class.

Explore Java encapsulation by designing a class with private fields, a constructor to initialize them, and public getters and setters to access the values.

Learn the this keyword in Java for referencing the current object and differentiating it from local variables. See how it can invoke constructors and pass the object to methods.

Learn how the super keyword refers to the immediate parent and enables access to base class members, highlighting its use in subclass relationships.

Learn static fields in Java, compare object-specific IDs and names, and practice setting and getting values across objects using a default constructor.

Explore how to use the throw keyword to explicitly throw exceptions in Java, and see how try-catch blocks handle errors like invalid age or voting restrictions.

Explore the final keyword in Java, showing how final variables cannot be reassigned, final methods cannot be overridden, and final classes cannot be inherited, including blank and static finals.

Learn how abstract classes in Java declare with abstract and non-abstract methods, hide implementation, and how they compare with interfaces, including why they cannot be instantiated.

Discover how interfaces in Java define contracts with abstract and default methods, and how classes implement multiple interfaces to enable flexible, polymorphic behavior.

Explore method overloading in Java programming for beginners, showing how multiple methods share the same name but differ by parameter types or counts, and how this improves program reliability.

Learn how method overriding enables runtime polymorphism by redefining a superclass method in a subclass with the same name and signature, while noting static methods cannot be overridden.

Demonstrate covariant return type in Java by overriding a method to return a subclass, such as dog food, while the parent method returns food.

Explore compile-time polymorphism through method overloading and static binding, and contrast it with runtime polymorphism via dynamic binding and method overriding, with practical Java examples.

Explore how inheritance works in Java, including single level inheritance and the roles of superclass and subclass. Learn how extends enables runtime polymorphism and common inheritance syntax.

Delve into multilevel inheritance by showing how a dog extends an animal, with child and baby dog sharing properties and behaviors like barking and eating.

Learn how aggregation relates objects through references, such as an employee having an address with city and country, and how this promotes reuse and object composition in Java.

Explore inner nested classes in Java, including non-static and static types such as member, anonymous, and local classes; learn how they access private members, and improve readability, maintainability, code optimization.

Explore how a member inner class is defined inside an outer class and how it can access the outer class's members in Java.

This lecture explains how to use anonymous inner classes in Java, showing how to implement interfaces or extend abstract classes on the fly and access their members.

Explore how to define a local inner class inside a method, instantiate it, and access its data members.

Learn how exception handling maintains the normal flow of a Java program, and differentiate checked exceptions, unchecked exceptions, and errors, with common examples, including null pointer and number format exceptions.

Explore Java exception handling, from the exception class hierarchy to checked and runtime exceptions, and write try-catch blocks with finally to manage errors and safely close resources.

Explore how Java handles multiple and nested exceptions using multi catch blocks, demonstrating try blocks that encounter index out of bounds, divide by zero, and other errors.

Explore exception handling in method overriding: learn how overriding behaves when the superclass method declares no exception versus when it declares one, and distinguish between unchecked and checked exceptions.

Learn to create a custom exception in Java by defining a class that extends exception, with a constructor, and using it to handle invalid input such as age under 18.

Understand string in Java as a sequence of characters, create strings via literal or new, apply operations like compare, concatenate, equals, and substring, and note Serializable, Comparable, and CharSequence interfaces.

Discover how Java strings are immutable and stored in the string pool, then compare strings using equals, ==, and compareTo, highlighting content versus reference equality and case sensitivity.

Learn Java string concatenation with the plus operator and assignment, and explore string immutability. Also master substring with start and end indices and index out of range errors.

Explore core java string class methods such as toUpperCase, toLowerCase, trim, startsWith, charAt, and length, building on substring and concatenation, plus intern and replace.

Explore the string buffer class in java to create and manipulate mutable strings, compare it with the immutable string class, and perform operations like insert, replace, reverse, delete, and substring.

Explore the StringBuilder class in java by comparing String and StringBuilder, highlighting immutability, efficiency in multi-threading, and methods like insert, delete, replace, and capacity.

Discover how to create immutable Java classes by declaring final classes and private fields, and exposing only getters via a constructor.