1Object, Classes, and UML1-16-20052Opening Discussion■Do you have any questions about the reading?■Have you thought any more about potential game ideas?3Objects and Classes■From your reading you should have a general idea of what object orientation is.■What is encapsulation?■What is the distinction between and object and a class?■What are the different visibility levels you can use in Java?■How does visibility of members impact encapsulation?4Car Example■I want you to break into groups and put together what you think a car would be like in Java. You can either write it in code format (ignore the fact that it will have errors) or you can write it in a comment in code.■Be as detailed as you can be here and don't be afraid to go out on a limb. Remember that you want to have both data and methods.5Writing Java■In Java all code goes inside of classes. Methods in a class have innate access to the data in that class.■Java is not 100% object-oriented. Primitive types in Java (int, double, etc.) are not objects, they have no members. This decision was made for efficiency.■Public members of a class define a “public interface”. These are the things that are known to outside code. They are hard to change without breaking other code. Data should never be public.6ACMEBank■Now let's do another example together. This is a rather standard example of a bank account. We will enhance it a bit to help demonstrate some features of Java.7this and Using Members■When you are writing a method of a class, it has direct access to the member data and methods of that class. You don’t have to use the ‘.’ notation.■To be explicit, you can use the ‘this’ keyword which implies the object that the method was invoked on.8static■The term static in the C-family languages implies something like “there is only one”. This is true in Java as well.■A static member or method is associated with the class itself, not with an object/instance of that class.■They can be reached or invoked without having an object of that class too.9main in Java■Like C/C++, Java programs always begin in a special method named main. However, in Java main is a static method of a class (remember there are no stand alone functions). Every class can have its own main which can be very helpful for debugging.■The signature of main ispublic static void main(String[] args) { }10Documentation Comments■In Java, comments that start with /** are documentation comments. These comments are used by javadoc to produce HTML documentation.■These comments should go above all classes and methods. Inside the comment you start with a summary sentence then have a paragraph describing the class or method. After that can come certain “tags” that begin with @.11Minute Essay■What are the reasons you should never make data
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