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You ll notice that a statement calls the calcGrade (rawTest) method and passes it the name of an array The calcGrade() method calculates and returns the grade back to this statement However, the statement does nothing with the grade Although this isn t a Java error, it is illogical to call the calcGrade() method without doing something with the grade returned by the method Therefore, you need to make sure it makes sense to your program to ignore the return value of a method A common practice among programmers is to call a method from within an expression when the return value of the method is used in the expression This is illustrated in the next example This example applies a curve to the grade calculated by calcGrade(), which you ve seen used in the previous example The call to the calcGrade() method is made within the expression that calculates the curve Java calls the method before evaluating the expression
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class Demo { public static void main (String args[]) { float rawTest[] = {70,100}; double finalGrade, curve = 12; finalGrade = curve * calcGrade (rawTest); Systemoutprintln( "Your final grade is: " + finalGrade ); } static float calcGrade (float test[]) { return (test[0]/test[1]) * 100; } }
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Polymorphism
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The Greeks coined a term to refer to something that has multiple forms polymorphism This term is also used by programmers to describe Java s capability to have a method take on different meanings (forms), depending on the context in which the method is called within a program Java implements polymorphism by enabling a programmer to overload a method A programmer overloads a method by defining two or more methods using the same name but defining different argument lists for each method You are probably wondering why any programmer would want to use the same name for two methods On the surface, this seems as if it would confuse anyone calling
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CHAPTER 6 Methods and Polymorphism
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the method However, overloading actually makes it easier to use methods because the programmer doesn t have to remember a lot of method names The programmer only needs to remember the method name and the appropriate argument lists The next example illustrates the benefits of overloading a method This example defines a method called displayError(), which displays an error message on the screen The error message is contained in the Systemoutprintln() statement within the body of the displayError() method You ll notice that this is a generic error message that doesn t provide any clue as to the nature of the error In some circumstances, this error message is fine In other circumstances, a programmer may want a more informative error message Therefore, we overloaded the displayError() method with another method called displayError() The other version of the displayError() method has one argument: the text of the error message that will be displayed on the screen A programmer has the option to call the displayError() method and use the generic error message or to call the other version and provide the displayError() method the error message to display on the screen In either case, the programmer still calls the displayError() method and either includes an argument in the method call or excludes the argument, depending on whether the programmer wants a generic error message or a custom error message displayed
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class Demo { public static void main (String args[]) { displayError(); displayError("Your printer is out of paper"); } static void displayError() { Systemoutprintln("An error has occurred" ); } static void displayError (String errorMsg) { Systemoutprintln(errorMsg); } }
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The Method Signature
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Although we tend to use a method name to identify a method, Java identifies a method by its signature As you ll recall from earlier in this chapter, a method s signature is the combination of the method name and the method argument list
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