question 7 of chapter 3

[Raymond Chamberglain]

I am completely confused with this question. Where in the world is the getBidValue(3) method (line 11)? Also some things I want to clarify some things. One of the answers say 'The output could contain @bf73fa'. What is that number? Is it the bit representation of an array object? Then Suits.SPADES.points can be accessed? So private members can be accessed by anything within the class, am I correct? Thank you for the help!!

public class Bridge {
 public enum Suits {
   CLUBS(20), DIAMONDS(20), HEARTS(30), SPADES(30),
   NOTRUMP(40) { public int getValue(int bid) {
     return ((bid-1)*30)+40; } };
   Suits(int points) { this.points = points; }
   private int points;
   public int getValue(int bid) { return points * bid; }
 }
 public static void main(String[] args) {
   System.out.println(Suits.NOTRUMP.getBidValue(3));
   System.out.println(Suits.SPADES + " " + Suits.SPADES.points);
   System.out.println(Suits.values());
 }
}

[pete stein]

Where in the world is the getBidValue(3) method (line 11)?

Looks like a typo to me where they're mixing getValue with getBidValue.

One of the answers say 'The output could contain @bf73fa'. What is that number?

That's that is the result of a toString call to the array. Better would be something like:

System.out.println(Arrays.toString(Suits.values()));

or a for-loop

Then Suits.SPADES.points can be accessed? So private members can be accessed by anything within the class, am I correct?

Yes they can, and since main is held within the class then private variables are accessible to the main method. Another perhaps more important question is: should main try to access this directly?

[Raymond Chamberglain]

So '@bf73fa' is a String representation to the array element?

[Raymond Chamberglain]

I'm sorry. The source is the 'Sun Certified Programmer for Java 6 Study Guide' by Kathy Sierra and Bert Bates.

[pete stein]

Raymond Chamberglain wrote:So '@bf73fa' is a String representation to the array element?

It can be part of a representation of any object that does not have a to String override. Array's usually begin with this character "[" then a class name, then a String similar to yours above.