MSIS 670 ObjectOriented Software Engineering Week 1 Introduction

MSIS 670 Object-Oriented Software Engineering Week 1 Introduction to Java: Applications 1. 1

Introduction Object-Oriented Programming n n OOP is more than learning a new language; it requires a new way of thinking. We must no longer think in terms of data structures - we must think in terms of objects. Many languages claim to have "Support for Object Technologies!" 2 1. 2

Java n The Java. TM programming language is designed to meet the challenges of application development in the context of heterogeneous, network-wide distributed environments. 3

Different Kinds of Java Applications Java Applets Java. Script Java. Server Pages Java Servlet technology Java. Server Faces (JSF) Java. Beans 4

How Java application works 5

Object An object is a software bundle of variables and related methods. Attribute (State) and Behavior (Method) Message 6

Class 12/29/2021 2. 7

The Class Declaration 8

Class Body Constructor Declarations for the Variables Methods to implement the behavior 9

Declaring Member Variables A class's state is represented by its member variables. You declare a class's member variables in the body of the class. 10

Implementing Methods 11

Understanding Instance and Class Members By default, unless otherwise specified, a member declared within a class is an instance member. To specify that a member variable is a class variable, use the static keyword. 12

Lab activities (Week 1) Tutorial 1 (JCreator LE) 13