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

Pitfalls


As with most programming constructs, loops have their own set of potential pitfalls. In this section we will address areas that can present problems to the unwary developer.

One common problem occurs when programmers use a semicolon after every statement. For example, the following statement results in an infinite loop because of the extra semicolon:

int i = 1;
while(i < 10) ;
  i++;

The semicolon on a line by itself is the empty statement. This statement does nothing. However, in this example it constitutes the body of the while loop. The increment statement is not part of the while loop. It is the first statement that follows the while loop. Indention, while desirable, does not make the statement a part of the loop. Thus, i is never incremented and the logical control expression will always return true.

Failure to use a block statement for the body of a loop can be a problem. In the following example we attempt to calculate the sum of the product of the numbers from 1 to 5. However...