K&B SCJP 5: topic page 62 second example

[MatthewTheNth Smith]

A member of our study group pointed out the following.

The second example of page 62, showing an enum as in inner class does not compile. The Coffee object (defined on page 61) cannot see the enum, because it is an inner class:

public class CoffeeTest1
{
    enum CoffeeSize {BIG, HUGE, OVERWHEMLING };

    public static void main(String[] args ) {
Coffee drink = new Coffee();
drink.size = CoffeeSize.BIG;
    }
}
 

To get it to compile, you can change Coffee to reference the enum in CoffeeeTest1? like

class Coffee {
   CoffeeTest1.CoffeeSize size;
}

or, move Coffee into the CoffeeTest1 as a static inner class. It must be static.

public class CoffeeTest1
{
   static class Coffee {
      CoffeeSize size;
   }
...
}

[ April 03, 2007: Message edited by: MatthewTheNth Smith ]

[Chandra Bhatt]

Hi Smith,

Yeah, if enum is public, it must be placed in an independent file, while enum definition can come under a class too.

This is the rule that in a file there can be at most one public class. So therefore if enum is public and not inside the class definition it must be kept in an independent file. Inside the class definition it can be private or protected or public. But independently only public can be used, no modifier default access as usually.

Thanks and Regards,
cmbhatt

[MatthewTheNth Smith]

Thanks.