Static and runtime types: Correct Solution

Given the following type declarations:

public class Flarvi {
    public Flarvi chesm(Flarvi chod) {
        return this;
    }
}

public class TacIngno extends Flarvi {
    public Flarvi chesm(Flarvi chod) {
        return new Preslic();
    }
}

public class Preslic extends Flarvi {
    public Flarvi chesm(Flarvi chod) {
        return chod;
    }
}

...and given the following setup code:

Flarvi foo = new TacIngno();
Preslic bar = new Preslic();

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.chesm(foo).chesm(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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