By C. Thomas Wu
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Extra resources for A comprehensive introduction to object-oriented programming with Java, 1st Edition
Now let’s look at an example of class methods. 6 returns the maximum possible speed of all Robot objects. A method such as getMaximumSpeed that deals with collective information about the instances of a class is usually defined as a class method. So we define an instance method for a task that pertains to an individual instance and a class method for a task that pertains to all instances. Message walk with the argument 25. 4 Sending the message walk to a Robot object. This shows that we are not sending any argument.
13. 14. 15. 16. program keeps track of students who are registered for a given semester. For each student registered, the program maintains the student’s name, address, and phone number; the number of classes in which the student is enrolled; and the student’s total credit hours. The program also keeps track of the total number of registered students. Define instance and class variables of a Student class that is suitable for this program. Suppose the minimum number and maximum number of courses for which a student can register are different depending on whether the student is a graduate, undergraduate, or work/study student.
The fastest CPU for commercially available personal computers was around 200 MHz in 1997 when the first edition of this textbook was published. But by the beginning of 1998, many vendors started selling 300-MHz machines. And in a mere 6 months, by the middle of 1998, the top-of-the-line personal computers were 400-MHz machines. 0-GHz (2000-MHz) CPU being advertised and sold. The increase of the CPU speed in the last two decades is truly astonishing. The clock speed of the Intel 8080, the CPU introduced in 1974 that started the PC revolution, was a mere 2 MHz.
A comprehensive introduction to object-oriented programming with Java, 1st Edition by C. Thomas Wu