Java Polymorphism code "Cannot find Constructor`

Question

I'm trying to explain java Polymorphism to my self so I've simply created a project showing that Family is the SuperClass and SubClasses areBrothersSisters`

The thing is when I compile I receive an error saying that Cannot find the Constructor Sisters Cannot find the Constructor Brothers

Could someone explain to me?

Thanks guys.

class Family {

private String name,age;

public Family(String name,String age){

    this.name = name;
    this.age = age;

}

public String toString(){

    return "name : " + name + "\tage " + age ;
}
}

class Brothers extends Family{

public Brothers(String name, String age){
    super(name,age);
}
}
class Sisters extends Family{

public Sisters(String name, String age){
    super(name,age);
}

 }

class FamilyTest{

public static void main(String[] args){

Family[] Member= new Family[3];

Member[1] = new Sisters("LALA",22);
Member[2] = new Brothers("Mike",18);
 }
 }

When learning about inheritance and polymorphism is is very important to keep the terminology straight and intuitive. Here: Is Brother a kind of Familiy? No, it is a FamilyMember. Please use this "... is a kind of ..." test upfront and before declaring classes. — A.H.
– A.H., Commented Oct 9, 2011 at 13:17

Tobias · Accepted Answer · 2011-10-09 11:58:02Z

3

You have age definded as String but you pass an integer to it.

Member[1] = new Sisters("LALA", "22");
Member[2] = new Brothers("Mike", "18");

should work but I would advice you to change age from String to int.

answered Oct 9, 2011 at 11:58

Tobias

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COD3BOY · Accepted Answer · 2011-10-10 01:31:29Z

1

public static void main(String[] args)
{
Family[] Member= new Family[3];

Member[1] = new Sisters("LALA","22");
Member[2] = new Brothers("Mike","18");

}

Replace the main() with this code,

The error was : arguments for the constructors of sisters and brothers were String, but you passed age as an Integer .

Sugggestion : you may change the type of age to int, which is more correct.

edited Oct 10, 2011 at 1:31

answered Oct 9, 2011 at 12:06

COD3BOY

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Ben · Accepted Answer · 2011-10-09 13:03:02Z

0

Please note that this is just one of the types of polymorphism you can use in Java, others are Generics and Function overloading

answered Oct 9, 2011 at 13:03

Ben

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