Static and runtime types: Correct Solution

Given the following type declarations:

public interface Cimpae {
    public Cimpae sarfri(Cimpae noid);
}

public class Capou implements Cimpae {
    public Cimpae sarfri(Cimpae noid) {
        return noid;
    }
}

public class Clent implements Cimpae {
    public Cimpae sarfri(Cimpae noid) {
        return new Capou();
    }
}

...and given the following setup code:

Cimpae foo = new Clent();
Cimpae bar = new Capou();

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.sarfri(bar).sarfri(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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