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Erschienen in:
2014 | OriginalPaper | Buchkapitel
2. Introduction to Objects
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Abstract
In this chapter, we will explain the following:
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What is a class, an object, a field, and a method
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That an object variable does not hold an object but, rather, a pointer (or reference) to where the object is actually located
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The distinction between a class variable (also called a static variable) and an instance variable (also called a non-static variable)
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The distinction between a class method (also called a static method) and an instance method (also called a non-static method)
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What the access modifiers public, private, and protected mean
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What is meant by information hiding
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How to refer to class and instance variables
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How to initialize class and instance variables
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What is a constructor and how to write one
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What is meant by overloading
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What is meant by data encapsulation
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How to write accessor and mutator methods
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How to print an object’s data in various ways
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Why the
tostring()method is special in Java -
What happens when we assign an object variable to another
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What it means to compare one object variable with another
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How to compare the contents of two objects
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How a function can return more than one value using an object