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Read or Download SCJP Sun Certified Programmer for Java 5 Study Guide (Exam 310-055) PDF
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Extra resources for SCJP Sun Certified Programmer for Java 5 Study Guide (Exam 310-055)
We'll cover static members in great detail in the next chapter. Things you can mark as static: n Methods n Variables n A class nested within another class, but not within a method (more on this in Chapter 8). indd 59 11/28/05 12:25:17 AM CertPrs8/Java 5 Cert. 0, Java lets you restrict a variable to having one of only a few pre-defined values—in other words, one value from an enumerated list. ) Using enums can help reduce the bugs in your code. For instance, in your coffee shop application you might want to restrict your size selections to BIG, HUGE, and OVERWHELMING.
0, Java lets you restrict a variable to having one of only a few pre-defined values—in other words, one value from an enumerated list. ) Using enums can help reduce the bugs in your code. For instance, in your coffee shop application you might want to restrict your size selections to BIG, HUGE, and OVERWHELMING. If you let an order for a LARGE or a GRANDE slip in, it might cause an error. Enums to the rescue. BIG; It's not required that enum constants be in all caps, but borrowing from the Sun code convention that constants are named in caps, it's a good idea.
BIG); } } Notice how each of the enumerated values, BIG, HUGE, and OVERWHELMING, are instances of type CoffeeSize. They're represented as static and final, which in the Java world, is thought of as a constant. Also notice that each enum value knows its index or position…in other words, the order in which enum values are declared matters. You can think of the CoffeeSize enums as existing in an array of type CoffeeSize, and as you'll see in a later chapter, you can iterate through the values of an enum by invoking the values() method on any enum type.