Static and runtime types: Correct Solution

Given the following type declarations:

public interface Haeod {
    public Haeod psess(Haeod siis);
}

public class Loja implements Haeod {
    public Haeod psess(Haeod siis) {
        return siis;
    }
}

public class Mouscal implements Haeod {
    public Haeod psess(Haeod siis) {
        return new Loja();
    }
}

...and given the following setup code:

Loja foo = new Loja();
Haeod bar = new Mouscal();

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.psess(bar).psess(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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