Lesson 1: Introduction to OOP and Basic Components of Java

Polymorphism

Ability to exist in various forms.

open brace {

Begins the body of the program

Encapsulation

Capturing data and keeping it safely and securely from outside interface.

SUN (Stanford University Network) Microsystem

Developed Java

Class heading

Everything that you use must be a part of a class

Home Appliances

First version of Java aimed to program

1994

In this year, he realized that such a language would be ideal for use with web browsers and Java's 6 connection to the internet began.

James Gosling

Invented the Java programming language in 1994 and implemented the first Java compiler.

1991

Java, having been developed in what year

Message Passing

Objects communicates through invoking methods and sending data to them. This feature of sending and receiving information among objects through function parameters.

Oak

Orignal name of Java

1. Class name 2. Method main

Parts of a Java Program

1. Encapsulation 2. Inheritance 3. Polymorphism 4. Abstraction 5. Message passing

Some Features of OOP

Abstraction

The ability to represent data at a very conceptual level without any details. It hides information to other class.

Comments/ Doc comments

The program simply ignores any statements that are inside

Inheritance

This is the process by which a class can be derived from a base class with all features of base class and some of its own.it increases code reusability

Applet

a Java program that adheres to certain conventions that allow it to run within a Java-enabled browser.

Java application

a standalone program that runs directly on the Java platform.

variable declaration

always contains two components: the type of the variable and its name

Object-Oriented Programming

an extension of procedural programming in which you take slightly different approach to writing computer programs.

Java VM

base for the Java platform and is ported onto various hardware-based platforms

Final Variables

cannot change after it has been initialized.

Unicode

character-coding system designed to support text written in diverse human languages.

relational operator

compares two values and determines the relationship between them.

argument

consist of information that a method requires to perform its task.

Access modifier

defines the circumstances under which a class can be accessed.

variable's data type

determines the values that the variable can contain and the operations that can be performed on it

Java platform

differs from most other platforms in that it's a software-only platform that runs on top of other, hardware-based platforms

procedural program

executes each statement in the literal order of its commands,

blank final

final variable that has been declared but not yet initialized

main()

first method that java program executes

platform

hardware or software environment in which a program runs.

Java bytecode

help make "write once, run anywhere" possible

1995

in this year, Netscape Incorporated released its latest version of the Netscape browser which was capable of running Java programs

Java API

large collection of ready-made software components that provide many useful capabilities grouped into libraries (packages) of related components.

Static

little change or stationary or unchanging

Public access

most liberal type of access.

Variables

nouns of a programming language-that is, they are the entities (values and data) that act or are acted upon.

Expressions

perform the work of a Java program. perform the computation indicated by the elements of the expression and return some value that is the result of the computation.

Java

programming language to design applications for the Internet

Netscape Incorporated

released its latest version of the Netscape browser which was capable of running Java programs.

expression

series of variables, operators, and method calls (constructed according to the syntax of the language) that evaluates to a single value.

ternary operator

short-hand for an if-else statement operator evaluates expression and returns op1 if it's true and op2 if it's false.

Security features and Architecturally Neutral

some advantages that made Java became popular

procedural program

step-by-step program that guides the application through sequence of instructions.

Java applet

the most well-known Java programs

Java Bytecodes/bytecode

translate a Java program into an intermediate language called