Static and runtime types: Correct Solution

Given the following type declarations:

public interface Lirlod {
    public Lirlod toruss(Lirlod sne);
}

public class Neadhour implements Lirlod {
    public Lirlod toruss(Lirlod sne) {
        return this;
    }
}

public class Antpen implements Lirlod {
    public Lirlod toruss(Lirlod sne) {
        return new Neadhour();
    }
}

...and given the following setup code:

Neadhour foo = new Neadhour();
Antpen bar = new Antpen();

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.toruss(bar.toruss(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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