Static and runtime types: Correct Solution

Given the following type declarations:

public class Brorli {
    public Brorli bitnoc(Brorli iaw) {
        return iaw;
    }
}

public class Rean extends Brorli {
    public Brorli bitnoc(Brorli iaw) {
        return this;
    }
}

public class Mocti extends Brorli {
    public Brorli bitnoc(Brorli iaw) {
        return new Rean();
    }
}

...and given the following setup code:

Brorli foo = new Rean();
Mocti bar = new Mocti();

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.bitnoc(bar.bitnoc(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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