Static and runtime types: Correct Solution

Given the following type declarations:

public class Pircil {
    public Pircil whoisi(Pircil ul) {
        return ul;
    }
}

public class Clesqien extends Pircil {
    public Pircil whoisi(Pircil ul) {
        return this;
    }
}

public class Ofrea extends Pircil {
    public Pircil whoisi(Pircil ul) {
        return new Ofrea();
    }
}

...and given the following setup code:

Pircil foo = new Ofrea();
Pircil bar = new Clesqien();

Part 1

Draw an AST for the following expression, labeling the static type (a.k.a. compile-time type) of each node in the tree:

foo.whoisi(bar.whoisi(bar))

(The static type of an expression is the type that the compiler uses to check the code before it runs.)

Solution

Part 2

Draw an AST for the same expression, this time labeling the runtime type of each node in the tree.

(The runtime type of an expression is the type of the actual value that appears when the code runs.)

Solution

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