ch4 - Chapter Four Defining Your Own Classes Topics...

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Chapter Four Defining Your Own Classes
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Topics Instantiable classes Components of a class constructors accessors mutators Visibility modifiers Class diagrams revisited
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Defining Instantiable Classes Learning how to define instantiable classes is the first step toward mastering the skills necessary in building large programs. A class is instantiable if we can create instances of the class. The DecimalFormat , GregorianCalendar , and String classes are all instantiable classes, while the Math class is not.
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Currency converter We need two methods for conversion: fromDollar and toDollar. CurrencyConverter yenConverter; double amountInYen, amountInDollar; yenConverter = new CurrencyConverter( ); ... amountInYen = yenConverter.fromDollar(200); // from dollar to yen amountInDollar = yenConverter.toDollar(15000); //from yen to dollar
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Currency converter Since the exchange rate fluctuates, we need a method to set the exchange rate. CurrencyConverter yenConverter; yenConverter = new CurrencyConverter( ); yenConverter.setExchangeRate(130.77);
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CurrencyConverter Want to convert both to and from dollars To convert, need to know exchange rate exchange rates fluctuate Class diagram for a CurrencyConverter object.
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Template for Instantiable Class
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