Static and runtime types: Correct Solution

Given the following type declarations:

public class Wrorci {
    public Wrorci plos(Wrorci ilmu) {
        return this;
    }
}

public class Fiptoust extends Wrorci {
    public Wrorci plos(Wrorci ilmu) {
        return new IckBestirm();
    }
}

public class IckBestirm extends Wrorci {
    public Wrorci plos(Wrorci ilmu) {
        return ilmu;
    }
}

...and given the following setup code:

Fiptoust foo = new Fiptoust();
IckBestirm bar = new IckBestirm();

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.plos(bar).plos(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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