By Danny C C Poo; Derek Beng Kee Kiong; Swarnalatha Ashok
ISBN-10: 1846289637
ISBN-13: 9781846289637
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Sample text
In a like manner, we group: • • • • Angel and Jaws into a Fish category; Sally and Lily into a Reptile category; Beatle and Ben into an Insect category; and Kermit into an Amphibian category. Figure 5-1 shows the six categories of animal we have produced so far. In object-oriented modeling, the act of categorizing objects is known as classification. The categories formed are known as classes. From a modeling perspective, classes form meaningful abstractions for organizing information; any reference to the classes would indirectly refer to the objects in the class.
It has the role of a middleman that does not work too much, but instead accepts input and passes it onto the CalculatorEngine. Similarly, feedback from the CalculatorEngine is collected and becomes output for the CalculatorInterface object. The implementation of CalculatorInterface consists of an initializing phase where a CalculatorEngine object is bound to an CalculatorInterface object, and an execution phase which performs the necessary dispatching. These are implemented by the constructor and run() methods of CalculatorInterface respectively, as illustrated in Listing 4-3.
Void digit(int x) { ... } int display() { ... } CalculatorEngine() { clear(); } } Listing 4-1: CalculatorEngine skeleton. 1 The clear() Method The clear() method initializes the CalculatorEngine object to the state for a calculator to begin the key sequence for next calculation. It is thus intuitive to set the variables value and keep to 0. 2 41 The display() Method To implement the display() method to provide computation results, we must first clarify the purposes of the instance variables value and keep.
Object-oriented programming and Java by Danny C C Poo; Derek Beng Kee Kiong; Swarnalatha Ashok
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