Static and runtime types: Correct Solution

Given the following type declarations:

public class Groc {
    public Groc genwut(Groc pras) {
        return new Ciallpid();
    }
}

public class Ehel extends Groc {
    public Groc genwut(Groc pras) {
        return this;
    }
}

public class Ciallpid extends Groc {
    public Groc genwut(Groc pras) {
        return pras;
    }
}

...and given the following setup code:

Ehel foo = new Ehel();
Groc bar = new Ciallpid();

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.genwut(foo).genwut(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

Related puzzles: