Static and runtime types: Correct Solution

Given the following type declarations:

public class Adoeng {
    public Adoeng sweIwho(Adoeng ea) {
        return ea;
    }
}

public class Tiochei extends Adoeng {
    public Adoeng sweIwho(Adoeng ea) {
        return this;
    }
}

public class Iste extends Adoeng {
    public Adoeng sweIwho(Adoeng ea) {
        return new Iste();
    }
}

...and given the following setup code:

Iste foo = new Iste();
Tiochei bar = new Tiochei();

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.sweIwho(foo.sweIwho(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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