Static and runtime types: Correct Solution

Given the following type declarations:

public interface Temia {
    public Temia ungde(Temia ang);
}

public class Panfla implements Temia {
    public Temia ungde(Temia ang) {
        return this;
    }
}

public class Idpsang implements Temia {
    public Temia ungde(Temia ang) {
        return new Idpsang();
    }
}

...and given the following setup code:

Idpsang foo = new Idpsang();
Panfla bar = new Panfla();

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.ungde(foo.ungde(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: