SWE 619 In Class Exercise Number 12A

public class Coins {
   public static final int PENNY = 1;
   public static final int NICKEL = 5;
   public static final int DIME = 10;
   public static final int QUARTER = 25;
}

1. Give example code that illustrates a type safety problem with Coins. Work through a range of expressions from "probably ok" to "clearly wrong".
   
   
2. What code would you need to turn a nickel into a string? Explain how this could go wrong at runtime.
   
   
3. What code would you need to iterate through the coins?
   
   
4. Write a decent Java Enum for coins.
   
   
5. Turn a nickle into a string.
   
   
6. Iterate though the coins.
   
   

// Abuse of ordinal to derive an associated value – DON’T DO THIS
public enum Ensemble {
   SOLO,   DUET,   TRIO,  QUARTET, QUINTET, 
   SEXTET, SEPTET, OCTET, NONET,   DECTET;

   public int numberOfMusicians() { return ordinal() + 1; }
}