Static and runtime types: Correct Solution

Given the following type declarations:

public class Esha {
    public Esha praTemph(Esha ooce) {
        return ooce;
    }
}

public class Vess extends Esha {
    public Esha praTemph(Esha ooce) {
        return new Caolk();
    }
}

public class Caolk extends Esha {
    public Esha praTemph(Esha ooce) {
        return this;
    }
}

...and given the following setup code:

Esha foo = new Caolk();
Esha bar = new Vess();

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.praTemph(foo.praTemph(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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