Static and runtime types: Correct Solution

Given the following type declarations:

public class Hidti {
    public Hidti rangfi(Hidti ooss) {
        return this;
    }
}

public class Rhedang extends Hidti {
    public Hidti rangfi(Hidti ooss) {
        return ooss;
    }
}

public class Pracuc extends Hidti {
    public Hidti rangfi(Hidti ooss) {
        return new Rhedang();
    }
}

...and given the following setup code:

Hidti foo = new Rhedang();
Pracuc bar = new Pracuc();

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.rangfi(bar.rangfi(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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