Java For Everyone: Compatible with Java 5, 6, and 7, 2nd Edition

CHAPTER 3

DECISIONS

CHAPTER GOALS

To implement decisions using if statements

To compare integers, floating-point numbers, and strings

To write statements using the Boolean data type

To develop strategies for testing your programs

To validate user input

CHAPTER CONTENTS

3.1 THE IF STATEMENT

Syntax 3.1: if Statement

Programming Tip 3.1: Brace Layout

Programming Tip 3.2: Always Use Braces

Common Error 3.1: A Semicolon After the if Condition

Programming Tip 3.3: Tabs

Special Topic 3.1: The Conditional Operator

Programming Tip 3.4: Avoid Duplication in Branches

3.2 COMPARING NUMBERS AND STRINGS

Syntax 3.2: Comparisons

Common Error 3.2: Exact Comparison of Floating-Point Numbers

Common Error 3.3: Using == to Compare Strings

Special Topic 3.2: Lexicographic Ordering of Strings

How To 3.1: Implementing an if Statement

Worked Example 3.1: Extracting the Middle

Random Fact 3.1: The Denver Airport Luggage Handling System

3.3 MULTIPLE ALTERNATIVES

Special Topic 3.3: The switch Statement

3.4 NESTED BRANCHES

Programming Tip 3.5: Hand-Tracing

Common Error 3.4: The Dangling else Problem

Special Topic 3.4: Enumeration Types

Video Example 3.1: Computing the Plural of an English Word

3.5 PROBLEM SOLVING: ...