Get Objects First With Java A Practical Introduction Using BlueJ PDF

By David J. Barnes, Michael Kolling

Gadgets First With Java a realistic creation utilizing BlueJ fifth version

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1 Concept: Java objects model objects from a problem domain. Objects and classes If you write a computer program in an object-oriented language, you are creating, in your computer, a model of some part of the world. The parts that the model is built up from are the objects that appear in the problem domain. These objects must be represented in the computer model being created. The objects from the problem domain vary with the program you are writing. They may be words and paragraphs if you are programming a word processor, users and messages if you are working on a social-network system, or monsters if you are writing a computer game.

You will notice that this time you are prompted not only for a name of the instance, but also for some other parameters. Fill them in before clicking OK. 13 Return values As before, you can create multiple objects. And again, as before, the objects have methods that you can call from their pop-up menu. Concept: Result. Methods may return information about an object via a return value. 22 Create some student objects. Call the getName method on each object. Explain what is happening. When calling the getName method of the Student class, we notice something new: methods may return a result value.

The outer wrappings of different classes all look pretty much the same. The outer wrapping contains the class header, whose main purpose is to provide a name for the class. 6 Write out what you think the outer wrappers of the Student and LabClass classes might look like; do not worry about the inner part. 4 Fields, constructors, and methods | 23 in the outer wrapper of a class? Edit the source of the TicketMachine class to make the change, and then close the editor window. Do you notice a change in the class diagram?

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