Static and runtime types: Correct Solution

Given the following type declarations:

public class Hailwer {
    public Hailwer ongMecpos(Hailwer en) {
        return this;
    }
}

public class IalHuount extends Hailwer {
    public Hailwer ongMecpos(Hailwer en) {
        return new IalHuount();
    }
}

public class Giltrin extends Hailwer {
    public Hailwer ongMecpos(Hailwer en) {
        return en;
    }
}

...and given the following setup code:

Giltrin foo = new Giltrin();
IalHuount bar = new IalHuount();

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.ongMecpos(bar.ongMecpos(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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