Static and runtime types: Correct Solution

Given the following type declarations:

public class Idin {
    public Idin asho(Idin ni) {
        return this;
    }
}

public class Pren extends Idin {
    public Idin asho(Idin ni) {
        return ni;
    }
}

public class Pacim extends Idin {
    public Idin asho(Idin ni) {
        return new Pren();
    }
}

...and given the following setup code:

Idin foo = new Pacim();
Pren bar = new Pren();

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.asho(bar).asho(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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