Book Image

Oracle Certified Associate, Java SE 7 Programmer Study Guide

By : Richard M. Reese
Book Image

Oracle Certified Associate, Java SE 7 Programmer Study Guide

By: Richard M. Reese

Overview of this book

<p>Java SE 7 Associate Programmer certification adds to your qualification as a Java developer. Knowledge of Java is important, but knowing how to write an efficient and productive code adds to your skills and gives you an edge when you are planning to give the certification exam. Coverage of the objectives goes beyond a simple review of certification objectives.</p> <p>"Oracle Certified Associate, Java SE 7 Programmer Study Guide" addresses certification exam objectives and provides discussion and examples to show the best ways of applying Java language features in real world programming. You will gain in-depth understanding of Java by examining how objects are allocated in the heap and how methods are managed in the program stack.<br /><br />"Oracle Certified Associate, Java SE 7 Programmer Study Guide" covers all of the Java SE 7 Associate Programmer certification objectives. It starts with a high level overview of an application’s structure to provide a framework for subsequent chapters. Chapters are organized around common themes with emphasis on memory usage. You will get an in-depth and complete understanding of the run-time Java environment using the illustrations that show the impact of class and method usage on the program stack and heap. <br /><br />Augmenting the coverage of certification objectives are examples of how you can use the classes, methods, and techniques in a productive and sound manner. In addition, sample exam questions are given in each chapter.</p>
Table of Contents (16 chapters)
Oracle Certified Associate, Java SE 7 Programmer Study Guide
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface

The for-each statement


The for-each statement was introduced with the release of Java 5. It is sometimes referred to as the enhanced for loop. Advantages of using the for-each statement include:

  • It is unnecessary to provide end conditions for the counter variable

  • It is simpler and more readable

  • The statement provides opportunities for compiler optimization

  • The use of generics is simplified

The for-each statement is used in conjunction with collections and arrays. It provides an easier way to iterate through each member of an array or class that has implemented the java.util.Iterable interface. As the Iterable interface is the super interface of the java.util.Collection interface, the for-each statement can be used with those classes that implement the Collection interface.

The syntax of this statement is similar to the regular for statement, except for the contents of its parentheses. The contents include a data type followed by a variable, a colon, and then an array name or collection, illustrated...