Static and runtime types: Correct Solution

Given the following type declarations:

public interface Idbism {
    public Idbism rerOios(Idbism peol);
}

public class SwoRiosbris implements Idbism {
    public Idbism rerOios(Idbism peol) {
        return new SwoRiosbris();
    }
}

public class Prelid implements Idbism {
    public Idbism rerOios(Idbism peol) {
        return peol;
    }
}

...and given the following setup code:

Prelid foo = new Prelid();
Idbism bar = new SwoRiosbris();

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.rerOios(foo.rerOios(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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