Static and runtime types: Correct Solution

Given the following type declarations:

public interface PelMarpar {
    public PelMarpar togil(PelMarpar be);
}

public class Tessnin implements PelMarpar {
    public PelMarpar togil(PelMarpar be) {
        return this;
    }
}

public class CicRheaemos implements PelMarpar {
    public PelMarpar togil(PelMarpar be) {
        return be;
    }
}

...and given the following setup code:

PelMarpar foo = new CicRheaemos();
Tessnin bar = new Tessnin();

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.togil(foo).togil(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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