C++ overloading assignment operator change base class type to child

C++ overloading assignment operator change base class type to child

I'm coming from java so please bare with me. I've read several other
articles and can't seem to find an answer.
I've got a base class (Obj) header file shown below.
class Obj {
public:
Obj();
Obj(int);
int testInt;
bool worked();
virtual Obj & operator = (const Obj & other) {
if(this != &other) {
//other.testInt = this->testInt;
return *this;
}
}
};
Base class
Obj::Obj() {
}
Obj::Obj(int test) {
this->testInt = test;
}
bool Obj::worked() {
return false;
}
Here's the child class header
class Obj1 : public Obj {
public:
Obj1();
Obj1(int);
bool worked();
};
Child class
#include "Obj1.h"
Obj1::Obj1() {
}
Obj1::Obj1(int a) {
this->testInt = a / 2;
}
bool Obj1::worked() {
return true;
}
Here's my main class
int main() {
Obj obj = Obj(99);
Obj1 obj1 = Obj1(45);
obj = obj1;
if(obj.worked())
cout << "good" << obj.testInt << endl;
else cout << "bad " << obj.testInt << endl;
if(obj1.worked()) {
cout << "1good " << obj1.testInt << endl;
} else
cout << "1bad " << obj1.testInt << endl;
return 0;
}
Here's the output when it's ran
bad 99
1good 22
How do I get it so obj = obj1; (found in main above) changes the type of
obj to obj1 so that obj.worked() will return true? Essentially how do I
get it to behave like it would in java? I don't need a deep copy, I just
want to toss out what obj used to reference and have it point to obj1 (I
think thats how it works in java).