Static and runtime types: Correct Solution

Given the following type declarations:

public class Phic {
    public Phic eeeOowk(Phic ea) {
        return new SooEssso();
    }
}

public class SooEssso extends Phic {
    public Phic eeeOowk(Phic ea) {
        return this;
    }
}

public class Cubasm extends Phic {
    public Phic eeeOowk(Phic ea) {
        return ea;
    }
}

...and given the following setup code:

Cubasm foo = new Cubasm();
SooEssso bar = new SooEssso();

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.eeeOowk(foo.eeeOowk(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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