book

Java 5.0 Tiger: A Developer's Notebook

by Brett McLaughlin, David Flanagan

June 2004

Intermediate to advanced

202 pages

4h 31m

English

O'Reilly Media, Inc.

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A Note Regarding Supplemental Files
Copyright
The Developer’s Notebook Series
Notebooks Are...Notebooks Aren’t...Organization
Preface
OrganizationHow This Book Was WrittenAbout the ExamplesConventions Used in This BookHow to Contact UsAcknowledgments from BrettAcknowledgments from David
1. What’s New?
1.1. Working with Arrays1.1.1. How do I do that?1.1.2. What About...1.2. Using Queues1.2.1. How do I do that?1.2.2. What about...1.3. Ordering Queues Using Comparators1.3.1. How do I do that?1.4. Overriding Return Types1.4.1. How do I do that?1.5. Taking Advantage of Better Unicode1.5.1. How do I do that?1.5.2. What just happened?1.6. Adding StringBuilder to the Mix1.6.1. How do I do that?1.6.2. What about...
2. Generics
2.1. Using Type-Safe Lists2.1.1. How do I do that?2.1.2. What just happened?2.1.3. What about...2.2. Using Type-Safe Maps2.2.1. How do I do that?2.2.2. What just happened?2.3. Iterating Over Parameterized Types2.3.1. How do I do that?2.3.2. What about...2.4. Accepting Parameterized Types as Arguments2.4.1. How do I do that?2.4.2. What about...2.5. Returning Parameterized Types2.5.1. How do I do that?2.6. Using Parameterized Types as Type Parameters2.6.1. How do I do that?2.7. Checking for Lint2.7.1. How do I do that?2.7.2. What about...2.8. Generics and Type Conversions2.8.1. How do I do that?2.8.2. What just happened?2.8.3. What about...2.9. Using Type Wildcards2.9.1. How do I do that?2.9.2. What about...2.10. Writing Generic Types2.10.1. How do I do that?2.10.2. What about...2.11. Restricting Type Parameters2.11.1. How do I do that?2.11.2. What about...
3. Enumerated Types
3.1. Creating an Enum3.1.1. How do I do that?3.1.2. What just happened?3.1.3. What about...3.2. Declaring Enums Inline3.2.1. How do I do that?3.3. Iterating Over Enums3.3.1. How do I do that?3.3.2. What just happened?3.3.3. What about...3.4. Switching on Enums3.4.1. How do I do that?3.4.2. What just happened?3.4.3. What about...3.5. Maps of Enums3.5.1. How do I do that?3.6. Sets of Enums3.6.1. How do I do that?3.7. Adding Methods to an Enum3.7.1. How do I do that?3.7.2. What about...3.8. Implementing Interfaces with Enums3.8.1. How do I do that?3.9. Value-Specific Class Bodies3.9.1. How do I do that?3.9.2. What just happened?3.9.3. What about...3.10. Manually Defining an Enum3.10.1. How do I do that?3.11. Extending an Enum3.11.1. How do I do that?3.11.2. What about...
4. Autoboxing and Unboxing
4.1. Converting Primitives to Wrapper Types4.1.1. How do I do that?4.1.2. What just happened?4.2. Converting Wrapper Types to Primitives4.2.1. How do I do that?4.2.2. What about...4.3. Incrementing and Decrementing Wrapper Types4.3.1. How do I do that?4.3.2. What just happened?4.4. Boolean Versus boolean4.4.1. How do I do that?4.4.2. What about...4.5. Conditionals and Unboxing4.5.1. How do I do that?4.5.2. What just happened?4.6. Control Statements and Unboxing4.6.1. How do I do that?4.7. Method Overload Resolution4.7.1. How do I do that?4.7.2. What just happened?
5. varargs
5.1. Creating a Variable-Length Argument List5.1.1. How do I do that?5.1.2. What just happened?5.1.3. What about...5.2. Iterating Over Variable-Length Argument Lists5.2.1. How do I do that?5.2.2. What about...5.3. Allowing Zero-Length Argument Lists5.3.1. How do I do that?5.3.2. What about...5.4. Specify Object Arguments Over Primitives5.4.1. How do I do that?5.5. Avoiding Automatic Array Conversion5.5.1. How do I do that?
6. Annotations
6.1. Using Standard Annotation Types6.1.1. How do I do that?6.1.2. What just happened?6.1.3. What about...6.2. Annotating an Overriding Method6.2.1. How do I do that?6.2.2. What about...6.3. Annotating a Deprecated Method6.3.1. How do I do that?6.3.2. What about...6.4. Suppressing Warnings6.4.1. How do I do that?6.5. Creating Custom Annotation Types6.5.1. How do I do that?6.5.2. What about...6.6. Annotating Annotations6.6.1. How do I do that?6.7. Defining an Annotation Type’s Target6.7.1. How do I do that?6.7.2. What about...6.8. Setting the Retention of an Annotation Type6.8.1. How do I do that?6.9. Documenting Annotation Types6.9.1. How do I do that?6.10. Setting Up Inheritance in Annotations6.10.1. How do I do that?6.10.2. What about...6.11. Reflecting on Annotations6.11.1. How do I do that?6.11.2. What just happened?6.11.3. What about...

7. The for/in Statement
7.1. Ditching Iterators7.1.1. How do I do that?7.1.2. What just happened?7.1.3. What about...7.2. Iterating over Arrays7.2.1. How do I do that?7.2.2. What about...7.3. Iterating over Collections7.3.1. How do I do that?7.4. Avoiding Unnecessary Typecasts7.4.1. How do I do that?7.4.2. What just happened?7.5. Making Your Classes Work with for/in7.5.1. How do I do that?7.5.1.1. Extending collection classes7.5.1.2. Handling iteration manually7.6. Determining List Position and Variable Value7.6.1. How do I do that?7.7. Removing List Items in a for/in Loop7.7.1. How do I do that?7.7.2. What about...
8. Static Imports
8.1. Importing Static Members8.1.1. How do I do that?8.1.2. What about...8.2. Using Wildcards in Static Imports8.2.1. How do I do that?8.2.2. What about...8.3. Importing Enumerated Type Values8.3.1. How do I do that?8.4. Importing Multiple Members with the Same Name8.4.1. How do I do that?8.4.2. What about...8.5. Shadowing Static Imports8.5.1. How do I do that?
9. Formatting
9.1. Creating a Formatter9.1.1. How do I do that?9.2. Writing Formatted Output9.2.1. How do I do that?9.2.1.1. Types9.2.1.2. Precision9.2.1.3. Width9.2.1.4. Argument9.2.1.5. Flags9.2.1.6. Output9.3. Using the format( ) Convenience Method9.3.1. How do I do that?9.4. Using the printf( ) Convenience Method9.4.1. How do I do that?
10. Threading
10.1. Handling Uncaught Exceptions in Threads10.1.1. How do I do that?10.1.2. What about...10.2. Using Thread-Safe Collections10.2.1. How do I do that?10.2.1.1. ConcurrentHashMap10.2.1.2. CopyOnWriteArrayList10.2.1.3. CopyOnWriteArraySet10.2.2. What just happened?10.2.3. What about...10.3. Using Blocking Queues10.3.1. How do I do that?10.4. Specifying Timeouts for Blocking10.4.1. How do I do that?10.4.2. What about...10.5. Separating Thread Logic from Execution Logic10.5.1. How do I do that?10.5.2. How do I do that?10.5.3. What about...10.6. Using Executor as a Service10.6.1. How do I do that?10.7. Using Callable Objects10.7.1. How do I do that?10.8. Executing Tasks Without an ExecutorService10.8.1. How do I do that?10.8.2. What about...10.9. Scheduling Tasks10.9.1. How do I do that?10.9.2. What about...10.10. Advanced Synchronizing10.10.1. How do I do that?10.11. Using Atomic Types10.11.1. How do I do that?10.11.2. What about...10.12. Locking Versus Synchronization10.12.1. How do I do that?10.12.2. What about...
Index
About the Authors
Colophon
Copyright

Content preview from Java 5.0 Tiger: A Developer's Notebook

Chapter 7. The for/in Statement

Note

In this chapter:

One of the coolest things about Tiger is that it offers so many new language features. When Java 1.3 and 1.4 were released, they had some new goodies, but most of the changes were either implementation issues (like all the Collection class restructuring), or things you didn’t use everyday (like proxies). Tiger is very different, though—you get to write new, funky-looking code, and that’s about as good as it gets for hardcore developers.

This chapter examines one of these new language features, the for/in loop. This name is a bit deceiving, as the loop never uses the in keyword; as a result, it’s often called enhanced for , and even sometimes foreach. No matter what you call it, though, it’s mostly a convenience function—it doesn’t make Java do anything particularly new, but it does save some keystrokes. If you’re an emacs or vi guy, that’s pretty nice—the less you type, the more advanced a programmer you must be, right?

Ditching Iterators

At its most basic, the for/in statement gets rid of the need to use the java.util.Iterator class. That class, useful in looping over collections of objects, was rarely useful in and of itself. Instead, it made looping, and accessing the objects in that loop, possible. As ...

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