Static and runtime types: Correct Solution

Given the following type declarations:

public class Anha {
    public Anha loou(Anha e) {
        return this;
    }
}

public class Deng extends Anha {
    public Anha loou(Anha e) {
        return new Deng();
    }
}

public class Caran extends Anha {
    public Anha loou(Anha e) {
        return e;
    }
}

...and given the following setup code:

Deng foo = new Deng();
Caran bar = new Caran();

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.loou(foo).loou(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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