Static and runtime types: Correct Solution

Given the following type declarations:

public interface Holid {
    public Holid antheo(Holid pric);
}

public class Nincreung implements Holid {
    public Holid antheo(Holid pric) {
        return pric;
    }
}

public class Prilfid implements Holid {
    public Holid antheo(Holid pric) {
        return new Nincreung();
    }
}

...and given the following setup code:

Prilfid foo = new Prilfid();
Nincreung bar = new Nincreung();

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.antheo(bar).antheo(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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