Static and runtime types: Correct Solution

Given the following type declarations:

public class Stro {
    public Stro jesIstve(Stro pha) {
        return pha;
    }
}

public class Bochen extends Stro {
    public Stro jesIstve(Stro pha) {
        return new Miasscein();
    }
}

public class Miasscein extends Stro {
    public Stro jesIstve(Stro pha) {
        return this;
    }
}

...and given the following setup code:

Stro foo = new Bochen();
Stro bar = new Miasscein();

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.jesIstve(bar.jesIstve(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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