[PDF] [PDF] 761 Learning Java An Introduction to Real-World Programming with

View - Download [PDF] 761 Learning Java An Introduction to Real-World Programming with

Previous PDF

Next PDF

Marc Loy,

Patrick Niemeyer

& Daniel Leuck

Learning

Java

An Introduction to Real-World Programming

with Java Fifth

Edition

Marc Loy, Patrick Niemeyer, and Daniel Leuck

Learning Java

An Introduction to Real-World

Programming with Java

FIFTH EDITIONBostonFarnhamSebastopolTokyoBeijingBostonFarnhamSebastopolTokyoBeijing

978-1-492-05627-0

[LSI]Learning Java by Marc Loy, Patrick Niemeyer, and Daniel Leuck Copyright © 2020 Marc Loy, Patrick Niemeyer, Daniel Leuck. All rights reserved.

Printed in the United States of America.

Published by O'Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472.

O'Reilly books may be purchased for educational, business, or sales promotional use. Online editions are

also available for most titles (http://oreilly.com). For more information, contact our corporate/institutional

sales department: 800-998-9938 or corporate@oreilly.com.Acquisitions Editor: Suzanne McQuade

Developmental Editor: Amelia Blevins

Production Editor: Beth Kelly

Copyeditor: Sonia Saruba

Proofreader: Christina EdwardsIndexer: Angela Howard

Interior Designer: David Futato

Cover Designer: Karen Montgomery

Illustrator: Rebecca DemarestMay 2000:

First Edition

July 2002:

Second Edition

May 2005:

Third Edition

June 2013:

Fourth Edition

March 2020:

Fifth Edition

Revision History for the Fifth Edition

2020-03-27: First Release

See http://oreilly.com/catalog/errata.csp?isbn=9781492056270 for release details.

The O'Reilly logo is a registered trademark of O'Reilly Media, Inc. Learning Java, the cover image, and

related trade dress are trademarks of O'Reilly Media, Inc. While the publisher and the authors have used good faith efforts to ensure that the information and

instructions contained in this work are accurate, the publisher and the authors disclaim all responsibility

for errors or omissions, including without limitation responsibility for damages resulting from the use of

or reliance on this work. Use of the information and instructions contained in this work is at your own

risk. If any code samples or other technology this work contains or describes is subject to open source

licenses or the intellectual property rights of others, it is your responsibility to ensure that your use

thereof complies with such licenses and ghts.

Table of Contents

Preface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . xi 1.

A Modern Language. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. 1

Enter Java 2

Java's Origins 2

Growing Up 3

A Virtual Machine 4

Java Compared with Other Languages 7

Safety of Design 10

Simplify, Simplify, Simplify... 11

Type Safety and Method Binding 12

Incremental Development 13

Dynamic Memory Management 13

Error Handling 14

Threads

15

Scalability

15

Safety of Implementation 16

The Verifier 17

Class Loaders 19

Security Managers 19

Application and User-Level Security 20

A Java Road Map 21

The Past: Java 1.0-Java 11 21

The Present: Java 14 23

The Future 25

Availability 25

iii

2.A First Application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . 27

Java Tools and Environment 28

Installing the JDK 28

Installing OpenJDK on Linux 29

Installing OpenJDK on macOS 30

Installing OpenJDK on Windows 31

Configuring IntelliJ IDEA and Creating a Project 35

Running the Project 39

Grabbing the Learning Java Examples 39

HelloJava 41

Classes

44

The main() Method 44

Classes and Objects 46

Variables and Class Types 46

HelloComponent 47

Inheritance 48

The JComponent Class 49

Relationships and Finger-Pointing 50

Package and Imports 51

The paintComponent() Method 52

HelloJava2: The Sequel 53

Instance Variables 55

Constructors 56

Events 58

The repaint() Method 60

Interfaces 60

Goodbye and Hello Again 623.

Tools of the Trade. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . 63

JDK Environment 63

The Java VM 64

Running Java Applications 64

System Properties 66

The Classpath 66

javap 68

Modules 68

The Java Compiler 69

Trying Java 70

JAR Files

77

File Compression 77

The jar Utility 77

The pack200 Utility 80

iv | Table of Contents

Building Up 814.

The Java Language. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. 83

Text Encoding 84

Comments 86

Javadoc Comments 87

Variables and Constants 89

Types 90

Primitive Types 91

Reference Types 95

Inferring Types 97

Passing References 97

A Word About Strings 98

Statements and Expressions 99

Statements 100

Expressions 108

Arrays 114

Array Types 115

Array Creation and Initialization 115

Using Arrays 117

Anonymous Arrays 119

Multidimensional Arrays 119

Types and Classes and Arrays, Oh My! 121

5.

Objects in Java. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . 123

Classes

124

Declaring and Instantiating Classes 125

Accessing Fields and Methods 127

Static Members 131

Methods

134

Local Variables 135

Shadowing 135

Static Methods 137

Initializing Local Variables 139

Argument Passing and References 140

Wrappers for Primitive Types 141

Method Overloading 143

Object Creation 145

Constructors 145

Working with Overloaded Constructors 146

Object Destruction 148

Garbage Collection 148

Table of Contents | v

Packages

149

Importing Classes 150

Custom Packages 151

Member Visibility and Access 153

Compiling with Packages 155

Advanced Class Design 155

Subclassing and Inheritance 156

Interfaces 161

Inner Classes 163

Anonymous Inner Classes 165

Organizing Content and Planning for Failure 1676.

Error Handling and Logging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169

Exceptions

170

Exceptions and Error Classes 170

Exception Handling 172

Bubbling Up 175

Stack Traces 176

Checked and Unchecked Exceptions 177

Throwing Exceptions 178

try Creep 182

The finally Clause 183

try with Resources 184

Performance Issues 185

Assertions

186

Enabling and Disabling Assertions 187

Using Assertions 188

The Logging API 189

Overview 189

Logging Levels 191

A Simple Example 192

Logging Setup Properties 193

The Logger 195

Performance 195

Real-World Exceptions 196

7.

Collections and Generics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197

Collections

197

The Collection Interface 198

Collection Types 199

The Map Interface 201

Type Limitations 203

vi | Table of Contents

Containers: Building a Better Mousetrap 203

Can Containers Be Fixed? 205

Enter Generics 205

Talking About Types 208

"There Is No Spoon" 209

Erasure 210

Raw Types 211

Parameterized Type Relationships 213

Why Isn't a List a List