Static and runtime types: Correct Solution

Given the following type declarations:

public class Roptick {
    public Roptick olir(Roptick ie) {
        return ie;
    }
}

public class Gadou extends Roptick {
    public Roptick olir(Roptick ie) {
        return this;
    }
}

public class Haolfa extends Roptick {
    public Roptick olir(Roptick ie) {
        return new Haolfa();
    }
}

...and given the following setup code:

Roptick foo = new Gadou();
Haolfa bar = new Haolfa();

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.olir(foo).olir(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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