Static and runtime types: Correct Solution

Given the following type declarations:

public interface Meban {
    public Meban icnam(Meban ifec);
}

public class Siou implements Meban {
    public Meban icnam(Meban ifec) {
        return new Tedma();
    }
}

public class Tedma implements Meban {
    public Meban icnam(Meban ifec) {
        return ifec;
    }
}

...and given the following setup code:

Meban foo = new Tedma();
Siou bar = new Siou();

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.icnam(foo).icnam(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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