请问多样性特点是什么 如何修改一下程序中的getPropertyDetails和setPropertyDetails能让他产生多样性特点 谢谢

class Owner
{
protected:
 string name;
 int mobile;
public:
 Owner(string, int);
 string getName();
 int getMobile();
};
 Owner::Owner(string Name, int Mobile)
 {
 name=Name;
 mobile=Mobile;
 }
 string Owner::getName()
 {
 return name;
 }
 int Owner::getMobile()
 {
 return mobile;
 }
 

class Property: public Owner
 {
protected:
 string addr;
 int area;
public:
 Property(string,int,string,int);
 string getPropertyDetails();  
 void setPropertyDetails(string,int,string,int);
 };
 
Property::Property(string Name, int Mobile, string Addr, int Area):Owner(Name, Mobile)
 {
 addr=Addr;
 area=Area;
 }

string Property::getPropertyDetails()
 {

cout<<"Name: "<<name<<endl<<"Mobile: "<<mobile<<endl<<"Addr: "<<addr<<endl<<"Area: "<<area<<endl<<endl;
return (name, mobile,addr,area);
}
void Property::setPropertyDetails(string Name, int Mobile, string Addr, int Area)
 {
 name=Name;
 mobile=Mobile;
 addr=Addr;
 area=Area;
 }
 

能说的详细点么  谢谢