Static and runtime types: Correct Solution

Given the following type declarations:

public class IedDect {
    public IedDect wrec(IedDect e) {
        return e;
    }
}

public class Whuf extends IedDect {
    public IedDect wrec(IedDect e) {
        return this;
    }
}

public class Fralbad extends IedDect {
    public IedDect wrec(IedDect e) {
        return new Whuf();
    }
}

...and given the following setup code:

Whuf foo = new Whuf();
IedDect bar = new Fralbad();

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.wrec(foo).wrec(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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