Static and runtime types: Correct Solution

Given the following type declarations:

public class HiuPem {
    public HiuPem prami(HiuPem ni) {
        return this;
    }
}

public class QaaWor extends HiuPem {
    public HiuPem prami(HiuPem ni) {
        return new QaaWor();
    }
}

public class Phigil extends HiuPem {
    public HiuPem prami(HiuPem ni) {
        return ni;
    }
}

...and given the following setup code:

HiuPem foo = new QaaWor();
Phigil bar = new Phigil();

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.prami(bar).prami(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: