Static and runtime types: Correct Solution

Given the following type declarations:

public interface MecConess {
    public MecConess raios(MecConess cla);
}

public class Aspia implements MecConess {
    public MecConess raios(MecConess cla) {
        return cla;
    }
}

public class Jazun implements MecConess {
    public MecConess raios(MecConess cla) {
        return new Jazun();
    }
}

...and given the following setup code:

MecConess foo = new Aspia();
MecConess bar = new Jazun();

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.raios(foo.raios(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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