Static and runtime types: Correct Solution

Given the following type declarations:

public interface Ilkprier {
    public Ilkprier peldac(Ilkprier ar);
}

public class Ucschrec implements Ilkprier {
    public Ilkprier peldac(Ilkprier ar) {
        return new Clis();
    }
}

public class Clis implements Ilkprier {
    public Ilkprier peldac(Ilkprier ar) {
        return ar;
    }
}

...and given the following setup code:

Ilkprier foo = new Ucschrec();
Ilkprier bar = new Clis();

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.peldac(bar.peldac(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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