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Engineers
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Judith Bishop
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Java Gently for Engineers
and Scientists
INTERNATIONAL COMPUTER SCIENCE SERIES
Consulting Editor: A D McGettrick University of Strathclyde
SELECTED TITLES IN THE SERIES
Software Development with Z J B Wordsworth
Program Verification N Francez
Concurrent Systems: An Integrated Approach to Operating Systems, Database, and
Distributed Systems (2nd edn) J Bacon
Concurrent Programming <A Burns and G Davies
Comparative Programming Languages (2nd edn) L B Wilson and R G Clark
Programming in Ada 95 (2nd edn) J G P Barnes
Software Design D Budgen
Ada 95 From the Beginning (3rd edn) J Skansholm
Programming Language Essentials H E Bal and D Grune
Human-Computer Interaction J Preece et al.
Distributed Systems: Concepts and Design (2nd edn) G Coulouris, J Dollimore and
T Kindberg
Fortran 90 Programming TM R Ellis, I R Philips and T M Lahey
Foundations of Computing: System Development with Set Theory and Logic
T Scheurer
Principles of Object-Oriented Software Development 4 Eliéns
Object-Oriented Programming in Eiffel (2nd edn) P Thomas and R Weedon
Compiler Design R Wilhelm and D Maurer
Miranda: The Craft of Functional Programming S$ Thompson
Haskell: The Craft of Functional Programming (2nd edn) S Thompson
Software Engineering (Sth edn) J Sommerville
Compiler Construction N Wirth
Software Engineering with BJ B Wordsworth
Functional CP Hartel and H Muller
Java Gently: Programming Principles Explained (2nd edn) J Bishop
C++ From the Beginning J Skansholm
Ada 95 for C and C++ Programmers S Johnston
Algorithms and Data Structures: Design, Correctness, Analysis (2ndedn) J Kingston
Discover Delphi: Programming Principles Explained S$ Williams and S Walmsley
Introductory Logic and Sets for Computer Scientists N Nissanke
Discrete Mathematics for Computer Scientists (2nd edn) J K Truss
Introduction to Programming using SML_M Hansen and H Rischel
Algorithms: a Functional Programming Approach F Rabhi and G Lapalme
Java Gently for Engineers
and Scientists
Judith M Bishop
Department of Computer Science
University of Pretoria
Nigel T Bishop
Department of Mathematics, Applied Mathematics and Astronomy
University of South Africa
An imprint of Pearson Education
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Visit us on the World Wide Web at:
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First published 2000
© Pearson Education Limited 2000
The rights of Judith Bishop and Nigel Bishop to be identified as
authors of this Work have been asserted by them in accordance
with the Copyright, Designs and Patents Act 1988.
All rights reserved; no part of this publication may be reproduced, stored
in a retrieval system, or transmitted in any form-or by any means, electronic,
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products are claimed as trademarks. Pearson Education Limited has made every
attempt to supply trademark information about manufacturers and their products
mentioned in this book. A list of the trademark designations and their owners
appears below.
ISBN 0-201-34304-5
British Library Cataloguing-in-Publication Data
A catalogue record for this book is available from the British Library
Library of Congress Cataloging-in-Publication Data
A catalog record for this book can be obtained from the Library of Congress
10987654321
05 04 03 02 01 00
Typeset by 43
Printed and bound in Great Britain by
T.J. International Ltd., Padstow, Cornwall
Trademark Notice
The following are trademarks or registered trademarks of their respective companies: Unix is a trademark of X/Open
Company Ltd; Windows, Windows 95, Windows NT, Visual Basic, Visual J++ and MS-DOS are trademarks of Microsoft
Corporation; Netscape and Netscape Communicator are trademarks of Netscape Communications Corporation; Explorer
is a trademark of Microsoft; Mosaic is a trademark of the University of Illinois; Macintosh, iMac and MacOS are
trademarks of Apple Computer Inc.; Pentium and Intel are trademarks of Intel Corporation; Silicon Graphics is a
trademark of Silicon Graphics Inc.; Java Workshop, HotJava, Java Development Kit and Java Platform 2 are trademarks of
Sun Microsystems Inc.; GIF is a trademark of Unisys Corporation; Symantec Café is a trademark of Symantec
Corporation; JBuilder is a trademark of Borland; CodeWarrior is a trademark of Metrowerks; Linux is a trademark of
Linus Torvalds; Kawa is a trademark of Tek-Tools.
To our parents in France, Francoise and Michael
And in memory of Jean, Yvonne, Francis and Irene
who were always so interested in our scientific careers
Digitized by the Internet Archive
in 2022 with funding from
Kahle/Austin Foundation
https://archive.org/details/javagentlyforengOO00Obish
Contents
Example programs and Case studies
Preface Xill
Chapter | Introduction
1.1 Welcome to Java
1.2 Software development
1.3 Scientific computing
1.4 Getting started with Java
1.5 The web site
Quiz °
Chapter 2 Simple programs
2.1 Two starter programs
2.2 Java basics
2.3 Beginning with output
2.4 Expressions and assignment
2.5 Numerical computing
Quiz
Problems
Chapter 3 Structuring
3.1 Properties of a good program
3.2 Repetition with for-loops
3.3. Input and output on a display
3.4 Making methods
5d lneGaaoh.class
3.6 Numerical methods with for-loops
Quiz
Problems
viii Contents
Chapter 4 Controlling 99
4.1 Files for input and output 99
4.2. The types boolean and char 106
4.3 Selection with if-else and switch 1 it
4.4 Conditional loops with while and do 116
4.5 Handling exceptions [21
4.6 Arithmetic accuracy 126
4.7 Numerical methods with while-loops 133
Quiz 138
Problems lie)
Chapter 5 Arrays and matrices 143
pel Simple arrays 143
5.2. Matrices 156
5.3 Numerical methods — linear curve fitting 161
5.4 Numerical methods — solving linear equations 167
5.5 Case study 1: Linear boundary value problem |Mi ge
Quiz 181
Problems 182
Chapter 6 Abstraction 185
6.1 Class power 185
6.2 Class-independent tables 190
6.3. Abstract methods and classes 196
6.4 Working within a hierarchy 206
6.5 Numerical methods with abstraction 216
6.6 Case study 2: Process control Zo
Quiz 238
Problems 239
Chapter 7 Customizing 243
7.1. Introduction to the awt 243
7.2 Laying out a GUI 255
7.3 Events, listeners and handlers 261
7.4 Inside the Graph class 267
