Static and runtime types: Correct Solution

Given the following type declarations:

public class Cafpont {
    public Cafpont ceaOpril(Cafpont gi) {
        return this;
    }
}

public class Esphe extends Cafpont {
    public Cafpont ceaOpril(Cafpont gi) {
        return new Smedod();
    }
}

public class Smedod extends Cafpont {
    public Cafpont ceaOpril(Cafpont gi) {
        return gi;
    }
}

...and given the following setup code:

Cafpont foo = new Esphe();
Smedod bar = new Smedod();

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.ceaOpril(bar).ceaOpril(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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