From the office.

[Jean-Francois Alban]

Hi guys

Here's a code we were playing with at the office.
What do you think is the expected outcome (no cheating don't run).
Also please provide a why to your answer. Thanks guys!!

public class Toto {

    public static void main(String[] args) {
        Toto toto = new Toto();
        System.out.print(toto.toString(toto.getMyObj()));
    }
    
    MyObj getMyObj(){
        return new MySubObj();
    }
    
    String toString(MyObj swap){
        return "MyObj";
    }
    
    String toString(MySubObj swap){
        return "MySubObj";
    }
}

class MyObj{
	
}

class MySubObj extends MyObj{
	
}

[Helen Ma]

public class Toto {

public static void main(String[] args) {
Toto toto = new Toto();
System.out.print(toto.toString(toto.getMyObj()));
}

MyObj getMyObj(){
return new MySubObj();
}

String toString(MyObj swap){
return "MyObj";
}

String toString(MySubObj swap){
return "MySubObj";
}
}

class MyObj{

}

class MySubObj extends MyObj{

}
public class Toto {

public static void main(String[] args) {
Toto toto = new Toto();
System.out.print(toto.toString(toto.getMyObj()));
}

MyObj getMyObj(){
return new MySubObj();
}

String toString(MyObj swap){
return "MyObj";
}

String toString(MySubObj swap){
return "MySubObj";
}
}

class MyObj{

}

class MySubObj extends MyObj{

}

I think the answer is MyObj.
From the code , the toString method seems overloaded correctly.
Step 1. toto.getMyObj() returns a MyObj object which is actually a MySubObj.
Step 2. What is passed in as the argument of toto.toString()? an object of MyObj type
Step 3. So, the toString(MyObj swap) is called instead of toString(MySubObj)
Step 4 Therefore, it prints MyObj.
Correct me if I am wrong.

[Jean-Francois Alban]

That's correct.
Naturally I would have assume that at runtime the JMV would sort it out and use MySubObj.