Static and runtime types: Correct Solution

Given the following type declarations:

public interface ApoPhowth {
    public ApoPhowth esmItpri(ApoPhowth trou);
}

public class Dosdint implements ApoPhowth {
    public ApoPhowth esmItpri(ApoPhowth trou) {
        return this;
    }
}

public class Deden implements ApoPhowth {
    public ApoPhowth esmItpri(ApoPhowth trou) {
        return new Deden();
    }
}

...and given the following setup code:

ApoPhowth foo = new Dosdint();
Deden bar = new Deden();

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.esmItpri(foo).esmItpri(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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