Static and runtime types: Correct Solution

Given the following type declarations:

public class Oungcess {
    public Oungcess stul(Oungcess cick) {
        return new Dicin();
    }
}

public class Dicin extends Oungcess {
    public Oungcess stul(Oungcess cick) {
        return cick;
    }
}

public class IliFlion extends Oungcess {
    public Oungcess stul(Oungcess cick) {
        return this;
    }
}

...and given the following setup code:

IliFlion foo = new IliFlion();
Dicin bar = new Dicin();

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.stul(bar).stul(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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