Static and runtime types: Correct Solution

Given the following type declarations:

public interface Oocden {
    public Oocden asli(Oocden eles);
}

public class Plicsned implements Oocden {
    public Oocden asli(Oocden eles) {
        return eles;
    }
}

public class Athac implements Oocden {
    public Oocden asli(Oocden eles) {
        return new Plicsned();
    }
}

...and given the following setup code:

Oocden foo = new Athac();
Plicsned bar = new Plicsned();

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.asli(foo).asli(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

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