Static and runtime types: Correct Solution

Given the following type declarations:

public interface Riodti {
    public Riodti ceiPadtea(Riodti de);
}

public class SpePioc implements Riodti {
    public Riodti ceiPadtea(Riodti de) {
        return this;
    }
}

public class Bruithit implements Riodti {
    public Riodti ceiPadtea(Riodti de) {
        return de;
    }
}

...and given the following setup code:

Riodti foo = new SpePioc();
Riodti bar = new Bruithit();

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.ceiPadtea(foo).ceiPadtea(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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