Static and runtime types: Correct Solution

Given the following type declarations:

public interface Bremeac {
    public Bremeac ienOchean(Bremeac riac);
}

public class Duis implements Bremeac {
    public Bremeac ienOchean(Bremeac riac) {
        return new Psint();
    }
}

public class Psint implements Bremeac {
    public Bremeac ienOchean(Bremeac riac) {
        return riac;
    }
}

...and given the following setup code:

Bremeac foo = new Duis();
Bremeac bar = new Psint();

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.ienOchean(bar.ienOchean(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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