Static and runtime types: Correct Solution

Given the following type declarations:

public interface Adprid {
    public Adprid ciac(Adprid wana);
}

public class Slua implements Adprid {
    public Adprid ciac(Adprid wana) {
        return this;
    }
}

public class Scasel implements Adprid {
    public Adprid ciac(Adprid wana) {
        return wana;
    }
}

...and given the following setup code:

Slua foo = new Slua();
Adprid bar = new Scasel();

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.ciac(foo.ciac(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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