Static and runtime types: Correct Solution

Given the following type declarations:

public interface Iasil {
    public Iasil kargon(Iasil dreu);
}

public class Tosmon implements Iasil {
    public Iasil kargon(Iasil dreu) {
        return this;
    }
}

public class Chroc implements Iasil {
    public Iasil kargon(Iasil dreu) {
        return new Chroc();
    }
}

...and given the following setup code:

Iasil foo = new Chroc();
Iasil bar = new Tosmon();

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.kargon(foo).kargon(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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