Static and runtime types: Correct Solution

Given the following type declarations:

public class Stualzo {
    public Stualzo fliacs(Stualzo oris) {
        return new Hioc();
    }
}

public class Hioc extends Stualzo {
    public Stualzo fliacs(Stualzo oris) {
        return oris;
    }
}

public class Siass extends Stualzo {
    public Stualzo fliacs(Stualzo oris) {
        return this;
    }
}

...and given the following setup code:

Stualzo foo = new Hioc();
Stualzo bar = new Siass();

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.fliacs(bar.fliacs(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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