124 Chapter 5 Of the five multiply() methods
124 Chapter 5 Of the five multiply() methods in the Calculator class, the parameter lists are different for each one. Therefore, this is an example of valid method overloading. The following OverloadDemo program instantiates a Calculator object and invokes the various multiply() methods. Study the OverloadDemo program carefully and try to determine the output. The actual output is shown in Figure 5.4. public class OverloadDemo { public static void main(String [] args) { System.out.println( Instantiating a Calculator… ); Calculator calc = new Calculator(); System.out.println( Initializing some variables… ); int a = 5; int b = 8; double d1 = 2.5; double d2 = -1.0; float f = 4.0F; int intAnswer = 0; double doubleAnswer = 0.0; intAnswer = calc.multiply(a, b); System.out.println(a + * + b + = + intAnswer); doubleAnswer = calc.multiply(d1, d2); System.out.println(d1 + * + d2 + = + doubleAnswer); intAnswer = calc.multiply(b); System.out.println(b + * + b + = + intAnswer); intAnswer = calc.multiply(a, b, a); System.out.println(a + * + b + * + a + = + intAnswer); doubleAnswer = calc.multiply(b, f); System.out.println(b + * + f + = + doubleAnswer); doubleAnswer = calc.multiply(d2, f); System.out.println(d2 + * + f + = + doubleAnswer); } } Figure 5.4 Output of the OverloadDemo program.
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