Static and runtime types: Correct Solution

Given the following type declarations:

public class Hodred {
    public Hodred jiprul(Hodred eri) {
        return new Ceias();
    }
}

public class Ceias extends Hodred {
    public Hodred jiprul(Hodred eri) {
        return this;
    }
}

public class Wolstrel extends Hodred {
    public Hodred jiprul(Hodred eri) {
        return eri;
    }
}

...and given the following setup code:

Hodred foo = new Ceias();
Hodred bar = new Wolstrel();

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.jiprul(bar.jiprul(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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