Static and runtime types: Correct Solution

Given the following type declarations:

public class Poent {
    public Poent eaeRhi(Poent en) {
        return this;
    }
}

public class Ircu extends Poent {
    public Poent eaeRhi(Poent en) {
        return en;
    }
}

public class Gelel extends Poent {
    public Poent eaeRhi(Poent en) {
        return new Ircu();
    }
}

...and given the following setup code:

Gelel foo = new Gelel();
Ircu bar = new Ircu();

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.eaeRhi(foo.eaeRhi(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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