Static and runtime types: Correct Solution

Given the following type declarations:

public interface Onor {
    public Onor hian(Onor asad);
}

public class Thend implements Onor {
    public Onor hian(Onor asad) {
        return this;
    }
}

public class Buen implements Onor {
    public Onor hian(Onor asad) {
        return asad;
    }
}

...and given the following setup code:

Thend foo = new Thend();
Buen bar = new Buen();

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.hian(bar).hian(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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