Static and runtime types: Correct Solution

Given the following type declarations:

public class Spliacs {
    public Spliacs meon(Spliacs me) {
        return this;
    }
}

public class Cious extends Spliacs {
    public Spliacs meon(Spliacs me) {
        return me;
    }
}

public class Ceaecu extends Spliacs {
    public Spliacs meon(Spliacs me) {
        return new Ceaecu();
    }
}

...and given the following setup code:

Cious foo = new Cious();
Spliacs bar = new Ceaecu();

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.meon(foo).meon(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: