Static and runtime types: Correct Solution

Given the following type declarations:

public class Trua {
    public Trua mungi(Trua vess) {
        return this;
    }
}

public class Antriu extends Trua {
    public Trua mungi(Trua vess) {
        return vess;
    }
}

public class Iiss extends Trua {
    public Trua mungi(Trua vess) {
        return new Iiss();
    }
}

...and given the following setup code:

Trua foo = new Antriu();
Trua bar = new Iiss();

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.mungi(foo).mungi(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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