Object-Oriented Programming Module 1 – Lesson 1
Module 1 – Lesson 1 03-26-21
Introduction to Object-oriented
Programming using Java
• Java – old language ; era of Visual Basic ; slowly phasing out – good for
beginners
• Classes – source
• Syntax: public static void main (String [] args)
• Function – it has name and a use; must be called ; accept an input, return an
output
• Main Program – accepts array of strings (String []) ; first to be executed
• String – sequence of words (“Hello World!”)
• Args – argument / variable; customizable; not a strict syntax
• Sytem.out.println – syntax for displaying output (ln – new line)
• Parameter – value of a variable
• .Class – to compile
• Cls – clear screen
• Static – scope, not replicable, one instance to exist in a program
class HelloWorld
{
public static void main (String [] args)
{
System.out.println(“Hello World!”);
}
}
Class
Main Program +
Function
Print
Data Type
(args [0]) → will not display anything
because there’s no defined parameter in
the function
However, this means that you can assign
infinite value for it through input only
until the declared args.
