Static and runtime types: Correct Solution

Given the following type declarations:

public class Aschac {
    public Aschac auhoss(Aschac pror) {
        return this;
    }
}

public class Psae extends Aschac {
    public Aschac auhoss(Aschac pror) {
        return new Osber();
    }
}

public class Osber extends Aschac {
    public Aschac auhoss(Aschac pror) {
        return pror;
    }
}

...and given the following setup code:

Aschac foo = new Psae();
Osber bar = new Osber();

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.auhoss(bar.auhoss(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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