Static and runtime types: Correct Solution

Given the following type declarations:

public interface Jadcha {
    public Jadcha irmDemfar(Jadcha ang);
}

public class Badhic implements Jadcha {
    public Jadcha irmDemfar(Jadcha ang) {
        return this;
    }
}

public class Blaa implements Jadcha {
    public Jadcha irmDemfar(Jadcha ang) {
        return new Badhic();
    }
}

...and given the following setup code:

Jadcha foo = new Blaa();
Jadcha bar = new Badhic();

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.irmDemfar(bar).irmDemfar(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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