classes

classes - Classes Java is an object-oriented language. It...

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Unformatted text preview: Classes Java is an object-oriented language. It is impossible to give a simple explanation for what that means. Java is organized around a construct known as a class. What is a class? It is the most prominent feature of the Java language for incorporating all program parts, for creating instances of data structures, and for the design of other classes. 1. incorporation (cue static ) 2. instantiation (cue new ) 3. inheritance (cue extends ) Classes I The class in Java is fundamental unit of program construction. And it has syntax: class ClassName { // Contents of class } The class is the major part of a compilation unit (the construct given to the compiler). Classes II A Java class is a template for creating new instances called objects. class ClassName { // Instance or member fields // Constructors // Instance or member methods } Instances are constructed using the keyword new followed by the name of the class. Arguments are permitted, provided an appropriate constructor has been defined. Two types: data structures and simulation objects Classes III Java classes can be used to derive other classes. This permits data structures to be organized to take advantage of their commonality (if any). Cues: the keyword extends and the related keyword implements . class ClassName extends SuperClass { // Changes and additions to the super class } Syntax A class declaration begins with the word class : <class declaration > ::= "class" <identifier >...
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classes - Classes Java is an object-oriented language. It...

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