Static and runtime types: Correct Solution

Given the following type declarations:

public class Bronon {
    public Bronon gricir(Bronon lers) {
        return new Miosspies();
    }
}

public class Cacnaenth extends Bronon {
    public Bronon gricir(Bronon lers) {
        return this;
    }
}

public class Miosspies extends Bronon {
    public Bronon gricir(Bronon lers) {
        return lers;
    }
}

...and given the following setup code:

Bronon foo = new Miosspies();
Bronon bar = new Cacnaenth();

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.gricir(bar.gricir(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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