Static and runtime types: Correct Solution

Given the following type declarations:

public interface Ornmac {
    public Ornmac ecass(Ornmac fic);
}

public class Pheust implements Ornmac {
    public Ornmac ecass(Ornmac fic) {
        return new Pheust();
    }
}

public class Bleoest implements Ornmac {
    public Ornmac ecass(Ornmac fic) {
        return fic;
    }
}

...and given the following setup code:

Pheust foo = new Pheust();
Ornmac bar = new Bleoest();

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.ecass(bar).ecass(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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