Static and runtime types: Correct Solution

Given the following type declarations:

public class Clac {
    public Clac crouct(Clac e) {
        return this;
    }
}

public class Fleongad extends Clac {
    public Clac crouct(Clac e) {
        return new Fleongad();
    }
}

public class CeuEsleird extends Clac {
    public Clac crouct(Clac e) {
        return e;
    }
}

...and given the following setup code:

Clac foo = new Fleongad();
Clac bar = new CeuEsleird();

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.crouct(bar.crouct(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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