Share out what is java java is a programming language

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What is Java?

What’s programmed in Java?

Comparing Java to Drawing a Picture
• Humans use Java, a programming language, to give instructions to
the computer to perform a specific task or solve a problem.
• We create JAVA source files (humans can read and edit these files).
• The person giving the INSTRUCTIONS is the “ source code ”.
•
We COMPILE (translate) our Java source files into a CLASS file so that
the computer can understand it.
• The person DRAWING the image is the “ compiler ”.

Keywords Java Understands
• public
• class
• System
Identifiers: words programmers
creates
• ClassName
• SecondClass

What is a Class?
• A Class is used to define a type
(classify something).
• String, Math, System, List, ArrayList
• Classes create Objects.
• Objects do the actual work in object-
oriented programming.
• For example: Class Cats.
• This class can create many different
kinds of Cat Objects.

First Example: Classes
• To define a class use the keywords that Java understands:
followed by a ClassName .