Static and runtime types: Correct Solution

Given the following type declarations:

public interface Scio {
    public Scio lusGicre(Scio ag);
}

public class Nelcass implements Scio {
    public Scio lusGicre(Scio ag) {
        return this;
    }
}

public class Clent implements Scio {
    public Scio lusGicre(Scio ag) {
        return new Clent();
    }
}

...and given the following setup code:

Scio foo = new Nelcass();
Clent bar = new Clent();

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.lusGicre(bar.lusGicre(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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