CSC1200 INTRODUCTION TO PROGRAMMING Dr. Maureen Markel

Chapter 1: Introduction Object-Oriented Program Development Using Java: A Class-Centered Approach

Objectives of Chapter 1 Computer Science and Programming Languages Objects and Classes Constructing a Java Program The PrintStream Class’s print() and println() Methods Using the javax.swing Package Programming Style Common Programming Errors

Computer Science and Programming Languages Information age –Almost totally dependent and driven by information technology Computer science –Science of computers and computing Computer scientists –Solve problems using the scientific method

Fundamental Areas of Computer Science This text will focus on: An introduction to computer architecture The Java programming language Class development and design Algorithm development

Programming Languages Computer program –Also called software –A self-contained set of instructions and data used to operate a computer to produce specific results Programming –process of developing and writing a program A programming language – is a set of instructions that can be used to construct a program

Programming Languages (continued) Low-level languages: –Machine language –Assembly language

Programming Languages (continued) High-level languages: –Use instructions that resemble natural languages –Can be run on a variety of computer types –Examples: Pascal Visual Basic C C++ Java

Programming Languages (continued) Source program –Programs written in a computer language Interpreted language –Each statement is translated individually and executed immediately upon translation Compiled language –All statements are translated as a complete unit before any one statement is executed

Programming Languages (continued) Java is both: –Compiled –Interpreted Java Virtual Machine –Software program that can read bytecode produced by the compiler and execute it

Procedure and Object Orientations Procedure-oriented language –Available instructions are used to create self- contained units Object-oriented language –Program must first define objects it will be manipulating Java is object-oriented

The Development of Java History: –Fortran –COBOL –BASIC –Pascal –C++ –Java

The Development of Java (continued) Web browser –A program located and run on a user’s computer to display Web pages –Java can run from a Web browser Java provides: –Cross-platform compatibility –Write-once-run-anywhere capability

Objects and Classes Objects –Part of the Java programming language as component types –Can be custom tailored by programmers –Programmers can define custom objects

A Class Is a Plan The structure for a class of objects must be created at the start of the programming process Class –Explicitly written plan –Complete set of parts and instructions needed to create items

From Recipe to Class Data declaration section –Description of data to be used Methods section –Defines how to combine data components to produce desired result

Task: Explain the following terms High level language Source Code Interpreted language Compiled language Characteristics of three different programming languages excluding Java Host computer Procedural language Object-oriented language Advantages of Java