Static and runtime types: Correct Solution

Given the following type declarations:

public class Fruc {
    public Fruc mintpo(Fruc dant) {
        return this;
    }
}

public class Litpiss extends Fruc {
    public Fruc mintpo(Fruc dant) {
        return dant;
    }
}

public class IarHadbli extends Fruc {
    public Fruc mintpo(Fruc dant) {
        return new IarHadbli();
    }
}

...and given the following setup code:

Litpiss foo = new Litpiss();
Fruc bar = new IarHadbli();

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.mintpo(foo.mintpo(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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