Static and runtime types: Correct Solution

Given the following type declarations:

public class Hoow {
    public Hoow ossce(Hoow zon) {
        return this;
    }
}

public class OriCesa extends Hoow {
    public Hoow ossce(Hoow zon) {
        return new OriCesa();
    }
}

public class Reedme extends Hoow {
    public Hoow ossce(Hoow zon) {
        return zon;
    }
}

...and given the following setup code:

Reedme foo = new Reedme();
OriCesa bar = new OriCesa();

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.ossce(foo.ossce(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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