Static and runtime types: Correct Solution

Given the following type declarations:

public class Hioss {
    public Hioss truc(Hioss lio) {
        return this;
    }
}

public class Ceasiass extends Hioss {
    public Hioss truc(Hioss lio) {
        return new Esind();
    }
}

public class Esind extends Hioss {
    public Hioss truc(Hioss lio) {
        return lio;
    }
}

...and given the following setup code:

Ceasiass foo = new Ceasiass();
Hioss bar = new Esind();

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.truc(bar).truc(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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