Static and runtime types: Correct Solution

Given the following type declarations:

public class Fohot {
    public Fohot precem(Fohot am) {
        return this;
    }
}

public class Temis extends Fohot {
    public Fohot precem(Fohot am) {
        return am;
    }
}

public class Dusm extends Fohot {
    public Fohot precem(Fohot am) {
        return new Temis();
    }
}

...and given the following setup code:

Temis foo = new Temis();
Fohot bar = new Dusm();

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.precem(bar).precem(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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