Introduction to Java
In this video, we will cover everything you need to know to get
started with Java programming. Java is one of the top three
most popular programming languages worldwide and is used
extensively by business enterprises, Android apps, and games.
Learning Java can also lead to a high-paying job as a Java
developer.
Why Learn Java?
Java is one of the most popular programming languages
worldwide
Java is an extremely flexible language
Java is used extensively by business enterprises,
Android apps, and games
Learning Java can lead to a high-paying job as a Java
developer
Java Basics
Computer languages are on a spectrum between being high
level and low level. Computers only understand binary, which is
referred to as machine code. To create machine code, we write
in a format called source code, which is understandable by
humans and compiles to machine code. When we compile our
source code to machine code, it's machine-specific. Java has an
intermediary step where we can compile our source code to a
format called bytecode, which is cross-platform and can be run
on different machines.
Getting Started with Java
1. Download the Java Development Kit (JDK)
2. Download an Integrated Development Environment (IDE)
3. Create a Java project and class
Java Development Kit (JDK) contains developer tools to help us
code and a Java Runtime Environment (JRE), which contains a
library toolkit and our Java Virtual Machine (JVM). An Integrated
Development Environment (IDE) provides an interface for us to
write, check for errors, compile, and run code.
, To create a Java project, we need a unique name and to
configure the JRE. Adding a class to the project is done by
selecting the project folder, going to file, new class, and
selecting a unique name. The class is a collection of related
code, and when we compile the source code to bytecode, we
create a new file with the dot class file extension.
Introduction to Java Programming
In Java programming, the main method is essential for running
the program. It is contained within the outer set of curly braces
of the class and any code within it will execute starting from
the top and working its way down. To print text to the console
window, we can use
the System.out.print or System.out.println methods.
The latter adds a new line character at the end of the text,
while the former does not. We can also use escape sequences
such as \n for a new line character or \t for a tab character.
Adding a Main Method
In order to run our code, we must have a main method within
the class. We can generate this method by checking the "public
static void main" checkbox when creating the class. If we
accidentally remove the method, we can simply type it in
ourselves: public static void main(String[] args) { } .
Any code within this method will execute when we run the
program.
Printing to the Console Window
To print text to the console window, we can use
the System.out.print or System.out.println methods. To
display text within double quotes, we must use an escape
sequence for the quotes: \" . Similarly, to display a backslash,
we must use \\ . We can also use escape sequences such
as \n for a new line character or \t for a tab character.
Comments and Multiline Comments
Comments are text within the code that are ignored by the
compiler. They can be used to leave notes for ourselves or
others who may be looking at our code. Single line comments
In this video, we will cover everything you need to know to get
started with Java programming. Java is one of the top three
most popular programming languages worldwide and is used
extensively by business enterprises, Android apps, and games.
Learning Java can also lead to a high-paying job as a Java
developer.
Why Learn Java?
Java is one of the most popular programming languages
worldwide
Java is an extremely flexible language
Java is used extensively by business enterprises,
Android apps, and games
Learning Java can lead to a high-paying job as a Java
developer
Java Basics
Computer languages are on a spectrum between being high
level and low level. Computers only understand binary, which is
referred to as machine code. To create machine code, we write
in a format called source code, which is understandable by
humans and compiles to machine code. When we compile our
source code to machine code, it's machine-specific. Java has an
intermediary step where we can compile our source code to a
format called bytecode, which is cross-platform and can be run
on different machines.
Getting Started with Java
1. Download the Java Development Kit (JDK)
2. Download an Integrated Development Environment (IDE)
3. Create a Java project and class
Java Development Kit (JDK) contains developer tools to help us
code and a Java Runtime Environment (JRE), which contains a
library toolkit and our Java Virtual Machine (JVM). An Integrated
Development Environment (IDE) provides an interface for us to
write, check for errors, compile, and run code.
, To create a Java project, we need a unique name and to
configure the JRE. Adding a class to the project is done by
selecting the project folder, going to file, new class, and
selecting a unique name. The class is a collection of related
code, and when we compile the source code to bytecode, we
create a new file with the dot class file extension.
Introduction to Java Programming
In Java programming, the main method is essential for running
the program. It is contained within the outer set of curly braces
of the class and any code within it will execute starting from
the top and working its way down. To print text to the console
window, we can use
the System.out.print or System.out.println methods.
The latter adds a new line character at the end of the text,
while the former does not. We can also use escape sequences
such as \n for a new line character or \t for a tab character.
Adding a Main Method
In order to run our code, we must have a main method within
the class. We can generate this method by checking the "public
static void main" checkbox when creating the class. If we
accidentally remove the method, we can simply type it in
ourselves: public static void main(String[] args) { } .
Any code within this method will execute when we run the
program.
Printing to the Console Window
To print text to the console window, we can use
the System.out.print or System.out.println methods. To
display text within double quotes, we must use an escape
sequence for the quotes: \" . Similarly, to display a backslash,
we must use \\ . We can also use escape sequences such
as \n for a new line character or \t for a tab character.
Comments and Multiline Comments
Comments are text within the code that are ignored by the
compiler. They can be used to leave notes for ourselves or
others who may be looking at our code. Single line comments
