Compound Assignment Operators

Java provides several compound assignment operators for abbreviating assignment expressions. Any statement of the form

variable = variable operator expression;

where operator is one of the binary operators +, -, *, / or % (or others we discuss later in the text) can be written in the form

variable operator= expression;

For example, you can abbreviate the statement

 c = c + 3;

with the addition compound assignment operator, +=, as

 c += 3;

The += operator adds the value of the expression on the right of the operator to the value of the variable on the left of the operator and stores the result in the variable on the left of the operator. Thus, the assignment expression c += 3 adds 3 to c. Figure 4.14 shows the arithmetic compound assignment operators, sample expressions using the operators and explanations of what the operators do.

Figure 4.14. Arithmetic compound assignment operators.

Assignment operator

Sample expression



Assume: int c = 3, d = 5, e = 4, f = 6, g = 12;


c += 7

c = c + 7

10 to c


d -= 4

d = d - 4

1 to d


e *= 5

e = e * 5

20 to e


f /= 3

f = f / 3

2 to f


g %= 9

g = g % 9

3 to g

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


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


Searching and Sorting

Data Structures



Introduction to Java Applets

Multimedia: Applets and Applications

GUI Components: Part 2



Accessing Databases with JDBC


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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