Static and runtime types: Correct Solution

Given the following type declarations:

public class IthOuspreg {
    public IthOuspreg beoPreba(IthOuspreg gint) {
        return gint;
    }
}

public class AtuHiur extends IthOuspreg {
    public IthOuspreg beoPreba(IthOuspreg gint) {
        return this;
    }
}

public class Quffe extends IthOuspreg {
    public IthOuspreg beoPreba(IthOuspreg gint) {
        return new Quffe();
    }
}

...and given the following setup code:

Quffe foo = new Quffe();
AtuHiur bar = new AtuHiur();

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.beoPreba(foo.beoPreba(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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