Static and runtime types: Correct Solution

Given the following type declarations:

public class Soru {
    public Soru priProgh(Soru mo) {
        return this;
    }
}

public class Pomou extends Soru {
    public Soru priProgh(Soru mo) {
        return new Pomou();
    }
}

public class LiaMua extends Soru {
    public Soru priProgh(Soru mo) {
        return mo;
    }
}

...and given the following setup code:

Pomou foo = new Pomou();
Soru bar = new LiaMua();

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.priProgh(foo.priProgh(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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