Product Method Overloading

问题

so I was working on this problem on CodeHS, then I was stuck for so long so decided to ask here.

The exercise is to overload the product method to allow for multiplying together other types of values:

two doubles
an int and a double
a double and an int
three ints

three doubles

public class Product extends ConsoleProgram
{
    public void run()
    {
        int intValue = 5;
        double doubleValue = 2.5;

        int product1 = product(intValue, intValue);
        System.out.println(product1);

        // Use method overloading to define methods 
        // for each of the following method calls

        double product2 = product(doubleValue, doubleValue);
        System.out.println(product2);

        int product3 = product(intValue, intValue, intValue);
        System.out.println(product3);

        double product4 = product(intValue, doubleValue);
        System.out.println(product4);

        double product5 = product(doubleValue, intValue);
        System.out.println(product5);

        double product6 = product(doubleValue, doubleValue, doubleValue);
        System.out.println(product6);
    }

    public int product(int one, int two)
    {
        return one * two;
    }
}

Thank you

回答1:

be aware that overloading means, the name of the method and the return type remains the same as the original/ initial method.

then you need to define/ implement those methods>

2 doubles would be:

public int product(double one, double two)
{
    return (int)(one * two);
}

an int and a double would be

public int product(int one, double two)
{
    return (int)(one * two);
}

etc

回答2:

Method overloading means you can create methods with same method name by changing those methods parameters (parameter count,parameter type and parameter Patterns). Combination of method name and parameters also called as method signature

Following is an example for method overloading.

public void int myMethod(){} 

public void int myMethod(int a){} 

public void String myMethod(String a){} 

public void double myMethod(int a , String a){} 

public void int myMethod(String a,int a){}

Note that you can't overload methods by changing return type

来源：https://stackoverflow.com/questions/47321881/product-method-overloading

标签

java

overloading