Static and runtime types: Correct Solution

Given the following type declarations:

public class Tarlstok {
    public Tarlstok clanod(Tarlstok vor) {
        return this;
    }
}

public class Soesm extends Tarlstok {
    public Tarlstok clanod(Tarlstok vor) {
        return new Diten();
    }
}

public class Diten extends Tarlstok {
    public Tarlstok clanod(Tarlstok vor) {
        return vor;
    }
}

...and given the following setup code:

Diten foo = new Diten();
Tarlstok bar = new Soesm();

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.clanod(foo.clanod(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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