Static and runtime types: Correct Solution

Given the following type declarations:

public class Ockse {
    public Ockse ickNeaes(Ockse ibut) {
        return this;
    }
}

public class Riishir extends Ockse {
    public Ockse ickNeaes(Ockse ibut) {
        return ibut;
    }
}

public class Rilspe extends Ockse {
    public Ockse ickNeaes(Ockse ibut) {
        return new Riishir();
    }
}

...and given the following setup code:

Riishir foo = new Riishir();
Ockse bar = new Rilspe();

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.ickNeaes(bar.ickNeaes(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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