Static and runtime types: Correct Solution

Given the following type declarations:

public class Asmo {
    public Asmo iera(Asmo mo) {
        return mo;
    }
}

public class Hevang extends Asmo {
    public Asmo iera(Asmo mo) {
        return this;
    }
}

public class Binlet extends Asmo {
    public Asmo iera(Asmo mo) {
        return new Binlet();
    }
}

...and given the following setup code:

Binlet foo = new Binlet();
Hevang bar = new Hevang();

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.iera(foo.iera(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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