By C. Thomas Wu
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Additional resources for A comprehensive introduction to object-oriented programming with Java, 1st Edition
Consider a hypothetical programming language called Kona. Using Kona, you can write a program to compute and print out the sum of 20 integers entered by the user: let sum = 0; repeat 20 times [ let X = next input; add X to sum; ] printout sum; Is Kona a high-level language? Why or why not? qxd 12/12/06 17:24 Page 15 1 Introduction to Object-Oriented Programming and Software Development O b j e c t i v e s After you have read and studied this chapter, you should be able to the basic components of object• Name oriented programming.
4 Sending the message walk to a Robot object. This shows that we are not sending any argument. getObstacleDistance( ) fido : Robot distance This shows the value distance is returned as a response to the message. 5 The result distance is returned to the sender of the message. 6 The maximum possible speed of all Robot objects is returned by the class method getMaximumSpeed. 1. Draw an object diagram of an Account object with instance methods deposit and withdraw. 2. Is the getObstacleDistance method an instance or a class method?
Once a class is defined, we can create as many instances of the class as a program requires. A class must be defined before you can create an instance (object) of the class. 3 shows a diagram that we will use throughout the book to represent a class. 1. Draw an object diagram for a Person class and two Person objects, Ms. Latte and Mr. Espresso. 2. What must be defined before you can create an object? qxd 18 12/12/06 Chapter 1 17:24 Page 18 Introduction to Object-Oriented Programming and Software Development