Java for Absolute Beginners

Learn Java datatypes, from byte and short to int and long, plus float, double, boolean, and char, with examples of memory usage and basic type casting.

Explore conditional execution in Java by using if and else statements with string comparisons to decide actions like staying home or going for a walk based on the weather.

Learn how to use conditional expressions with or and and operators to combine multiple conditions, implement if-else and else-if branches, and apply them to retirement and grade scenarios.

Explore how arrays work in Java, including indexing from zero, declaring string and integer arrays, populating elements, and reading and printing array values.

Practice looping in Java by using a for loop to print hello world 10 times, learning initialization, condition, and increment to repeat a block until the limit is reached.

Explore looping in Java with arrays, using for loops to print elements, compute sums, and find maximum values, while practicing array manipulation and basic data types.

Explore creating and calling methods with various return types, including void, string, int, double, and boolean, and printing results from main using system.out.

Explore Java classes as blueprints that define objects with methods and variables, and learn how subclasses inherit traits from parent classes, illustrated by dogs, pets, and vehicles.

Learn how static methods work in Java, call them without creating objects, and understand the main method alongside non-static, instance methods.

Explore instance methods in Java by creating student objects, calling instance methods, and printing personalized data, then compare static methods that run without objects and their memory implications.

Group related classes and interfaces into named namespaces with java packages, enabling easy maintenance, access protection, and organized code with built-in and user defined packages.

Explore how the integer class wraps the primitive int, enabling methods like doubleValue and string to integer parsing, and learn to compare numbers with compare and equals using the wrapper.

Learn the core of object oriented programming by exploring encapsulation, hiding data with private variables, and controlling access through getters and setters, illustrated with a customer class example.

Explore inheritance in Java by building a person base class and an employee subclass, applying encapsulation with private fields and getters, and using constructors and super to initialize objects.

Explore how abstraction hides implementation details in Java using abstract classes and interfaces, and see how subclasses implement abstract methods without instantiating abstract classes.

learn how collections group objects and provide a consistent api through the collection interface. explain array list implementing the list interface as a dynamic array with adding, removing, and iterating.

Master java file i/o by using byte streams and character streams, reading and writing files with file reader and file writer, handling path and exceptions, and using input and output.

Explore JUnit as a Java testing framework, write test methods with @Test, and verify outcomes using assertions, with setup and teardown via @Before, @After, @BeforeClass, and @AfterClass.

Explore Java fundamentals from Hello world to encapsulation, inheritance, and interfaces, and learn Maven-based project setup, testing, and file types such as characters and bytes.