Static and runtime types: Correct Solution

Given the following type declarations:

public interface Aeton {
    public Aeton hedpa(Aeton smil);
}

public class Idmo implements Aeton {
    public Aeton hedpa(Aeton smil) {
        return this;
    }
}

public class Menist implements Aeton {
    public Aeton hedpa(Aeton smil) {
        return smil;
    }
}

...and given the following setup code:

Idmo foo = new Idmo();
Menist bar = new Menist();

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.hedpa(bar).hedpa(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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