Static and runtime types: Correct Solution

Given the following type declarations:

public class Padlorm {
    public Padlorm cisast(Padlorm ec) {
        return ec;
    }
}

public class NirMio extends Padlorm {
    public Padlorm cisast(Padlorm ec) {
        return this;
    }
}

public class Denchli extends Padlorm {
    public Padlorm cisast(Padlorm ec) {
        return new NirMio();
    }
}

...and given the following setup code:

Padlorm foo = new NirMio();
Denchli bar = new Denchli();

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.cisast(foo).cisast(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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