Static and runtime types: Correct Solution

Given the following type declarations:

public interface Clotdi {
    public Clotdi osma(Clotdi iear);
}

public class Scodea implements Clotdi {
    public Clotdi osma(Clotdi iear) {
        return iear;
    }
}

public class Prosmdan implements Clotdi {
    public Clotdi osma(Clotdi iear) {
        return new Prosmdan();
    }
}

...and given the following setup code:

Prosmdan foo = new Prosmdan();
Scodea bar = new Scodea();

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.osma(foo.osma(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

Related puzzles: