New PDF release: Java Certification JumpStart

By Todd Greanier

ISBN-10: 0782142273

ISBN-13: 9780782142273

Java is the fastest-growing programming language, and is the reason why Sun's programmer and developer certifications are of the most well liked within the undefined. As well known as Java is, it may be a frightening subject for a newbie.

Java Certification JumpStart demystifies the topic and provides aspiring Java programmers the cast beginning they should pursue extra complex Java education. Written through an skilled teacher, this publication is a perfect first-step for Java certification applicants, or these contemplating a occupation in Java programming who've very little adventure with the expertise. And it is a excellent precursor to Sybex's best-selling whole Java 2 Certification examine consultant, 3ed (ISBN: 0782140777).

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Objects Objects are instances of classes. A class provides the blueprint for a type of object. An object is a real, unique instance of that type. Objects are the key to the power of the Java language. Objects are created based on the methods and variables defined in an underlying class. A class is like a blueprint for your objects, and all objects that are built from that class share the same basic characteristics. However, each object maintains its own private state; two objects that share the same class type are independent of each other when it comes to state.

So immediately after you create the array, you can access the value of the elements and they will all be zero. When you create an array of objects like a String[], the elements are < previous page page_138 next page > < previous page page_139 next page > Page 139 not initialized; all of the elements of the array default to null. Sure, you can access those values if you really want to, but they will not typically do you a lot of good! Be sure your arrays are fully initialized with correct, meaningful values before you access the elements.

Sort method. This method sorts the contents of an array according to its natural ordering. This essentially means the common ordering you would expect. So numbers are sorted in increasing order and String objects are sorted alphabetically. You will find this method helpful when you have a String array that you wish to ensure is in alphabetical order. natural ordering A process used in sorting algorithms to determine how a specific set of data should be ordered. This is normally ascending order for numbers and alphabetical order for characters and strings.

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Java Certification JumpStart by Todd Greanier

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