The Complete Java Course For Beginners

Explore how Java uses control flow statements, especially the if statement, to evaluate conditions, branch on true/false, use curly braces, and apply else blocks.

Learn how to use the greater-than, greater-than-or-equal-to, and less-than-or-equal-to operators in Java to determine voting eligibility via age-based if statements.

Learn how to nest if statements in Java and understand condition blocks with voting age logic, including true/false branches and testing in IntelliJ.

Master conditional logic in Java using if statements, else if branches, and the logical not operator with boolean expressions. Explore year examples with 2024 and 2025, showing comparisons.

Learn how the logical and operator in Java uses the double ampersand to yield true only when both expressions are true, demonstrated with score and isActive in an if statement.

Explore the logical or operator in Java, shown as a double vertical bar, a binary operator that returns true when at least one boolean expression is true, otherwise false.

Explore the Java switch statement, its cases, break, and default, and see how to read user input with a scanner to decide actions like wake up or relax.

Learn to replace a switch statement with an enhanced switch statement in IntelliJ IDEA, using arrow syntax, omitting break, and adding curly braces for multi-line code to keep logic concise.

Learn how to use the switch statement as an expression to return a value assigned to a variable from user input time, with cases for 12, 7, and a default.

Master the ternary operator in Java, a concise conditional using the ? : syntax to assign a value based on a boolean expression, instead of a full if statement.

Explore java loops with the for loop, including initialization, condition, and iteration, to repeatedly execute code, and use break and continue to control flow.

Learn how the while loop repeats code while a condition holds, and how the do while loop guarantees at least one execution with Java examples.

Master the for-each loop in Java to iterate arrays or collections and learn the var arg feature that allows a method to accept a variable number of arguments.

Learn how Java methods work as modular blocks of code inside a class, how to define public static void methods, pass parameters, and call them to output to the console.

Learn how Java methods return values, distinguish between methods and functions, and implement a max of two numbers using int, if, and return statements inside a class.

Explore how method overloading in Java lets a class have the same method name with different signatures and parameter lists, enabling multiple variants for doubles, ints, and more.

Learn to declare and use Java arrays, including int and string arrays, print with for-each and for loops, understand zero-based indexing, length, and the fixed-size nature.

Tackle an arrays challenge by implementing a getMarks function that returns the largest number from an int array in Java.

Learn how getters and setters implement encapsulation in Java by accessing private fields through getX and setX methods, including basic validation and practical car class examples.

Explore constructors in Java, including the empty constructor and multiple constructors, using default values to initialize object fields and show how one constructor calls another during object creation.

Explore inheritance by creating a vehicle superclass and car and plane subclasses, sharing common fields and methods, using extends, super, and override to customize behavior such as move and stop.

Explore the static keyword in Java, calling class methods and variables without creating objects, distinguishing class members from instance ones, and using static constants for shared values.

Explore abstract classes in Java as base blueprints you cannot instantiate; learn to define abstract and concrete methods, constructors, and subclass responsibilities with vehicle, car, and plane examples.

Learn how interfaces define abstract methods and constants to enable abstraction. See car, truck, and plane implement start engine differently, while sharing the interface’s contract of what to do.

discover how enum classes in Java define a fixed set of constants with the enum keyword, and learn to use them with switch statements to create structured, readable code.

Explore the difference between this and super keywords in Java, including how this references the current instance for constructor chaining and avoiding naming conflicts, and how super accesses the superclass.

Compare static methods and instance methods, noting that static methods belong to the class and require no instance, while instance methods require an object and access its state.

Explore anonymous classes in Java, local nameless classes declared and instantiated together to implement interfaces or extend a class for single-use event handling, demonstrated with a login button listener.

Explore how inner classes in Java, defined within another class, improve encapsulation, while creating and accessing a university and its department, and displaying their combined names.

Explore the Java collection framework, including root interface, set, list, and map interfaces, with implementations like array list and hash map, plus core operations such as add and contains.

Learn how sets, especially hash sets, enforce uniqueness by preventing duplicates and using equals method. See how casting and overriding equals and hashCode in a user class sustain set semantics.

Learn how maps store key-value pairs with a hash map in Java; declare a map with integer keys and string values, add elements with put, and retrieve with get.

Explore generics in Java 5 by creating type-parameterized classes and a generic team with a list of players, using casting to access names in IntelliJ IDEA.

Explore generics with upper bounds by constraining T with extends from the player class. Ensure types like football player have the getname method and remove casts.