Static and runtime types: Correct Solution

Given the following type declarations:

public class Cedo {
    public Cedo iase(Cedo co) {
        return new Ranoo();
    }
}

public class Prasgas extends Cedo {
    public Cedo iase(Cedo co) {
        return this;
    }
}

public class Ranoo extends Cedo {
    public Cedo iase(Cedo co) {
        return co;
    }
}

...and given the following setup code:

Prasgas foo = new Prasgas();
Ranoo bar = new Ranoo();

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.iase(foo).iase(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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