Static and runtime types: Correct Solution

Given the following type declarations:

public class Cofai {
    public Cofai tures(Cofai ge) {
        return ge;
    }
}

public class Varmmor extends Cofai {
    public Cofai tures(Cofai ge) {
        return this;
    }
}

public class Stioti extends Cofai {
    public Cofai tures(Cofai ge) {
        return new Stioti();
    }
}

...and given the following setup code:

Stioti foo = new Stioti();
Varmmor bar = new Varmmor();

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.tures(bar).tures(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: