Static and runtime types: Correct Solution

Given the following type declarations:

public interface Atri {
    public Atri ebre(Atri hess);
}

public class Inpon implements Atri {
    public Atri ebre(Atri hess) {
        return hess;
    }
}

public class Inci implements Atri {
    public Atri ebre(Atri hess) {
        return new Inpon();
    }
}

...and given the following setup code:

Inci foo = new Inci();
Inpon bar = new Inpon();

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.ebre(bar).ebre(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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