Static and runtime types: Correct Solution

Given the following type declarations:

public interface FliRicres {
    public FliRicres vamu(FliRicres ikma);
}

public class Miafi implements FliRicres {
    public FliRicres vamu(FliRicres ikma) {
        return ikma;
    }
}

public class Nelpein implements FliRicres {
    public FliRicres vamu(FliRicres ikma) {
        return new Miafi();
    }
}

...and given the following setup code:

FliRicres foo = new Miafi();
FliRicres bar = new Nelpein();

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.vamu(bar).vamu(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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