Type-Wrapper Classes for Primitive Types

Each primitive type (listed in Appendix D, Primitive Types) has a corresponding type-wrapper class (in package java.lang). These classes are called Boolean, Byte, Character, Double, Float, Integer, Long and Short. Each type-wrapper class enables you to manipulate primitive-type values as objects. Many of the data structures that we develop or reuse in Chapters 1719 manipulate and share Objects. These classes cannot manipulate variables of primitive types, but they can manipulate objects of the type-wrapper classes, because every class ultimately derives from Object.

Each of the numeric type-wrapper classesByte, Short, Integer, Long, Float and Doubleextends class Number. Also, the type-wrapper classes are final classes, so you cannot extend them.

Primitive types do not have methods, so the methods related to a primitive type are located in the corresponding type-wrapper class (e.g., method parseInt, which converts a String to an int value, is located in class Integer). If you need to manipulate a primitive value in your program, first refer to the documentation for the type-wrapper classesthe method you need might already be declared.

Introduction to Computers, the Internet and the World Wide Web

Introduction to Java Applications

Introduction to Classes and Objects

Control Statements: Part I

Control Statements: Part 2

Methods: A Deeper Look

Arrays

Classes and Objects: A Deeper Look

Object-Oriented Programming: Inheritance

Object-Oriented Programming: Polymorphism

GUI Components: Part 1

Graphics and Java 2D™

Exception Handling

Files and Streams

Recursion

Searching and Sorting

Data Structures

Generics

Collections

Introduction to Java Applets

Multimedia: Applets and Applications

GUI Components: Part 2

Multithreading

Networking

Accessing Databases with JDBC

Servlets

JavaServer Pages (JSP)

Formatted Output

Strings, Characters and Regular Expressions

Appendix A. Operator Precedence Chart

Appendix B. ASCII Character Set

Appendix C. Keywords and Reserved Words

Appendix D. Primitive Types

Appendix E. (On CD) Number Systems

Appendix F. (On CD) Unicode®

Appendix G. Using the Java API Documentation

Appendix H. (On CD) Creating Documentation with javadoc

Appendix I. (On CD) Bit Manipulation

Appendix J. (On CD) ATM Case Study Code

Appendix K. (On CD) Labeled break and continue Statements

Appendix L. (On CD) UML 2: Additional Diagram Types

Appendix M. (On CD) Design Patterns

Appendix N. Using the Debugger

Inside Back Cover





Java(c) How to Program
Java How to Program (6th Edition) (How to Program (Deitel))
ISBN: 0131483986
EAN: 2147483647
Year: 2003
Pages: 615
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