Static and runtime types: Correct Solution

Given the following type declarations:

public class Haur {
    public Haur amuc(Haur leit) {
        return leit;
    }
}

public class Motip extends Haur {
    public Haur amuc(Haur leit) {
        return this;
    }
}

public class Enphioss extends Haur {
    public Haur amuc(Haur leit) {
        return new Motip();
    }
}

...and given the following setup code:

Enphioss foo = new Enphioss();
Motip bar = new Motip();

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.amuc(bar.amuc(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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