Static and runtime types: Correct Solution

Given the following type declarations:

public interface VioPrart {
    public VioPrart duiss(VioPrart gich);
}

public class Chiourcrep implements VioPrart {
    public VioPrart duiss(VioPrart gich) {
        return this;
    }
}

public class Sosscol implements VioPrart {
    public VioPrart duiss(VioPrart gich) {
        return new Sosscol();
    }
}

...and given the following setup code:

Chiourcrep foo = new Chiourcrep();
VioPrart bar = new Sosscol();

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.duiss(foo).duiss(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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