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06Objects - CSE 114 Computer Science I Objects Lake...

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CSE 114 Computer Science I Objects Lake Superior, Michigan
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Primitives vs. Objects So far we have seen mostly primitives they store single values Ex: int i = 6; Now we will define/use our own complex types Classes/Objects they can store multiple values Ex: Die die; What objects have we used already?
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Object vs. Class What’s the difference? Class: defines a type, it’s a blueprint for making objects Object a variable of type Class Ex: String s = "Hello"; What’s the class name? What’s the object name? All String objects have the same instance variables (but different values) and methods.
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Die Object STATE (What information describes it?) Number of Faces – maximum numbers on dice Value facing up – number on upward face BEHAVIOR (What can we do with it?) Initialize – initializes state Roll – choose a random up-face value Read the value – get current up-face value
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The Basics of Defining Classes General format of a class: public class ClassName { instance variable declaration(s) method definition(s) } Instance variables == state Methods == behavior
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'.' When you make an object, you have access to: its instance variables its methods, which may use its instance variables '.' – used to access public instance variables and methods for a given object variable soon we’ll see we have options other than public Example: String name = "Richard"; String nickname = name.substring(0, 4);
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But what does '.' really do?
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