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Java for Beginners: A Complete Introduction to Java Programming

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Intro

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Java is a Programming Language

Compiled Languages vs. Interpreted Languages

Java is a Compiled and Interpreted Language

Java is a Platform

Java vs. JVM vs. JRE vs. JDK

Installation: Java Development Kit (JDK)

An IDE to write Java code!

Installation: IntelliJ IDEA

Start-up Guide: IntelliJ IDEA

Summary: Introduction to Java for Beginners

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What is Programming Logic?

Sequence: The Order of Instruction Execution

Input: Data Coming in from the Outside

Output: Displaying Output to the Outside

Conditionals: Decision Making with If and Else

Loops: Repeating Code with While and For

Summary: Programming Logic

Exercises: Programming Logic

Java Syntax

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What is a Variable?

Naming Variables in Java

Reserved Keywords in Java

Declaring Variables in Java

Data Types in Java

Java’s Primitive Data Types

Reference Types in Java

var a.k.a. Local Variable Type Inference

Literals in Java

Literal Numbers in Java

Literal Characters and Strings in Java

Literal Booleans and Boolean Expressions in Java

Final Variables in Java

Java Type Casting or Conversion

Expressions vs. Statements in Java

Scopes and Code Blocks in Java

Summary: Variables and Data Types in Java

Exercises: Variables and Data Types in Java

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Operators in Java

Arithmetic Operators in Java

Relational Operators in Java

Logical Operators in Java

Assignment Operators in Java

Bitwise Operators in Java

The Ternary Operator in Java

Other Java Operators

In what Order do Operators get Executed?

Summary: Operators in Java

Exercises: Operators in Java

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Conditionals: Java’s If-else

Switch Case: Java’s Switch

Loops: Java’s While and Do-while

Loops: Java’s For Loop

Methods: Reusing Code with Java’s Functions

Summary: Control Flow Statements in Java

Exercises: Control Flow Statements in Java

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Organising Classes into Packages

Importing Classes from Packages

Summary: Packages

Object-oriented Programming

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What is a Class and Object in Programming?

Classes in Java

Structure of a Java Class

Writing a Class in Java

Access Levels in Java

Fields in a Java Class

Methods in a Java Class

Method Overloading in Java

Method Recursion in Java

Method Varargs in Java

Constructors in a Java Class and Making Objects

Static Fields and Static Methods in a Java Class

Creating and Using Objects of our own Classes

Summary: Classes in Java

Exercises: Classes in Java

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Four Pillars of OOP

Abstraction in Java

Encapsulation in Java

Inheritance in Java

Polymorphism in Java

Summary: OOP in Java

Exercises: OOP in Java

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Class Inheritance in Java (“extends”, Superclasses, Subclasses)

The “super” and “this” Keywords

Overriding Inherited Methods in our Subclasses

Summary: Inheritance in More Detail

Exercises: Inheritance in More Detail

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What is an Abstract Class in Java?

Writing and Using Abstract Classes in Java

What are Interfaces in Java?

Writing and Implementing Interfaces in Java

Multiple Inheritance in Java with Interfaces

Interfaces vs. Abstract Classes in Java

Polymorphism in Java Revisited

Summary: Abstract Classes and Interfaces in Java

Exercises: Abstract Classes and Interfaces in Java

Exploring the Java Standard Library

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Declaring and Initialising Arrays in Java

Retrieving Elements in our Arrays in Java

Overwriting Elements in our Arrays in Java

Counting How Many Elements are in our Arrays in Java

Looping through an Array in Java

Looping through an Array with an Enhanced For Loop

2D Arrays: Arrays of Arrays in Java

Summary: Data Structures

Exercises: Data Structures

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Java’s String Class

The String Pool in Java

Java’s StringBuilder Class

Summary: String Pooling

Exercises: String Pooling

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How do we represent Time and Calendars in Java?

LocalDate, LocalTime and LocalDateTime

ChronoUnit and Period

Date and Time Formatting

Summary: Dates and Time

Exercises: Dates and Time

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What are Exceptions in Java?

Unchecked Exceptions

Checked Exceptions

Handling Exceptions with try-catch

The “finally” Block

Our Own Custom Exceptions

Summary: Exception Handling

Exercises: Exception Handling

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What are Wrapper Classes in Java?

Autoboxing and Unboxing in Java

Summary: Wrapper Classes

Exercises: Wrapper Classes

Finishing Up

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Summary: Java for Beginners

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