Static and runtime types: Correct Solution

Given the following type declarations:

public interface Phulurn {
    public Phulurn lecPavio(Phulurn te);
}

public class Pashfim implements Phulurn {
    public Phulurn lecPavio(Phulurn te) {
        return te;
    }
}

public class BeiSaisshasm implements Phulurn {
    public Phulurn lecPavio(Phulurn te) {
        return new BeiSaisshasm();
    }
}

...and given the following setup code:

Pashfim foo = new Pashfim();
Phulurn bar = new BeiSaisshasm();

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.lecPavio(foo).lecPavio(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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