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Lecture 9b - Java Class Fundamentals The Class Declaration...

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Java Class Fundamentals The Class Declaration The class is the fundamental programming unit in Java General form: accessKeyword class ClassName { ... } Delimiters = Opening/Closing braces keyword = Class class content = . . . ClassName = user specified class name Fields and Methods Are defined inside the class declaration Fields (variables) o Instance variables Are associated with each instance of the class (not shared) There may be 0 or more copies of these variables, one for each object that has been instantiated Are declared at the top level of the class with the general form: accessKeyword dataType varName; o Class variables Are associated with the class (not with instances) i.e. live at the “factory” There is only one copy of these variables Are declared at the top level of the class with the general form: accessKeyword static dateType varName; Fields and Methods
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Methods (member functions) o Instance methods Operate on a particular instance of a class (i.e. on an object)
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