C++对象构造问题

#include<iostream>
using namespace std;
class Base1{
public:
Base1(){
cout<<"Base1()"<<endl;
}
Base1(int a):base1a(a){
cout<<"Base1(int)"<<endl;
}
private:
int base1a;
};

class Base2{
public:
Base2(){
cout<<"Base2()"<<endl;
}
Base2(int b):base2a(b){
cout<<"Base2(int)"<<endl;
}
private:
int base2a;
};

class Derived:public Base1,public Base2{
public:
Derived(int a,int b):Base1(a),Base2(b),base1(a),base2(b){}
private:
Base1 base1;
Base2 base2;
};
int main(){

Derived d(2,3);
}