Static and runtime types: Correct Solution

Given the following type declarations:

public class ZulBied {
    public ZulBied tirOol(ZulBied mosh) {
        return mosh;
    }
}

public class Conbul extends ZulBied {
    public ZulBied tirOol(ZulBied mosh) {
        return this;
    }
}

public class Mameor extends ZulBied {
    public ZulBied tirOol(ZulBied mosh) {
        return new Conbul();
    }
}

...and given the following setup code:

ZulBied foo = new Conbul();
Mameor bar = new Mameor();

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.tirOol(bar.tirOol(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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