Programming Principles using

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Programming Principles using

• Michael Ulman

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Programming Principles using Java

• Course Organiser Michael Ulman
• Tower Hill room 217
• email m.ulman_at_londonmet.ac.uk
• phone [phone]

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Course Outline

• Introduction to Java and Object Oriented Concepts
• Java Virtual Machine
• BlueJ
• Identifiers, Data Types Variables
• Arithmetic programming
• Decisions
• Control Structures
• Methods
• Applets
• Java GUI

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Assessment

• Coursework 12
• 4 exercise solutions (3 each)
• a major exercise is one of these exercises
• Final Examination 88
• 2 hours
• section A a test of understanding of elementary
  Java
• section B based on the major exercise solution

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Textbook
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Other Books

• Teach Yourself Java Chris Wright
• Java Simplified Adam Shaw
• Introductory Java David Parsons

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Programming is about creating Software

• What is software?
• Where do we find software?
• what kinds of software are there?
• This is a PROGRAMMING course first.
• Learning to program is a complex skill, we are
  going to learn some of the basics

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Programs

• What is a Program ?
• Programs Data Algorithms
• Algorithm set of step by step instructions
• e.g a Recipe
• Data as Input, Algorithm Processes the data and
  the Results are Output

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first Java program source code
public class Hello public static void main
(String args) System.out.println(Hello
World)
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Programming Languages

• Machine Code language the processor understands
  
• each processor has its own instruction set
• written in binary 0s 1s
• 1111010011010100

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Program Development
source code
compilation
machine code
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Java History

• Inventor James Gosling at Sun Microsystems in
  1991 as part of Stealth, then Green Projects
• Originally called Oak
• For use on large distributed, network of
  consumer electronic devices all talking to each
  other

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Java History

• Javas first proposed use came in 1994 as an
  operating system for Interactive TV, this
  failed.
• What came along that could use such a language ?
  One that
• Works on many different platforms
• Works on networked computers
• Where security and reliability are important

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Java History

• World Wide Web applications for the Web
• Java was announced at SunWorld 95
• Netscape announced it would incorporate Java
  support in their browser, Microsoft followed suit
  with Internet Explorer

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Microsoft the dominant platform
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Java platform independent
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James Gosling Javas inventor
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Java is fun
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Java Virtual Machine

• JVM is a program that acts like a processor on
  which Java programs run
• JVM is what makes Java programs portable
• Write once run anywhere

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Java Platform Independence
C source file Hello.c
C source file Hello.c
Java Source file Hello.java
COMPILATION javac Hello.java
COMPILATION
BYTECODE Hello.class
INTERPETATION on the Java Virtual Machine java
Hello
MACHINE CODE
MACHINE CODE
MACHINE CODE
MACHINE CODE
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Java Development Kit

• JDK is Suns free command line development
  environment
• Java source files have a .java extension
• Use javac myclass.java to compile your sourcefile
  to bytecode
• Results in a file with a .class extension
• To run your Java program on its interpreter java
  myclass

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first Java program
public class Hello public static void main
(String args) System.out.println(Hello
World)
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second Java program

• import javax.swing.JOptionPane
• public class Welcome
• public static void main(String args)
• JOptionPane.showMessageDialog(
• null, Welcome\nto\nJava\nProgramming!,
  JOptionPane.PLAIN_MESSAGE)
• System.exit(0)

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Output of Welcome program
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Running our first program

• project Welcome is in U\CS1F03C\Week1\Welcome
• copy project Welcome to the X or a floppy on A
• To run BlueJ go to L\BlueJ
• click on BlueJ.exe

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BlueJ
L\BlueJ - click on BlueJ.exe
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BlueJ - opening a project
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BlueJ projects
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BlueJ Design Window - Welcome class
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BlueJ Editor Window source code
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BlueJ selecting a method
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BlueJ method call
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BlueJ output window
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BlueJ

• www.BlueJ.org
• Getting Started with Java
• Getting Started at Home with Java
• in U\CS1F03C

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