SCJP Sun Certified Programmer for Java 5 Study Guide (Exam by Katherine Sierra, Bert Bates
By Katherine Sierra, Bert Bates
Get the ebook that exhibits you not just what to check, yet the best way to research. the single classroom-based built-in research process for pro certification delivers whole assurance of all ambitions for the solar qualified Programmer for Java five examination, countless numbers of perform examination questions, and hands-on routines. The CD-ROM gains complete perform examination software program plus an adaptive try engine.
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Additional resources for SCJP Sun Certified Programmer for Java 5 Study Guide (Exam 310-055)
Example text
Abstract Methods An abstract method is a method that's been declared (as abstract) but not implemented. In other words, the method contains no functional code. And if you recall from the earlier section "Abstract Classes," an abstract method declaration doesn't even have curly braces for where the implementation code goes, but instead closes with a semicolon. In other words, it has no method body. You mark a method abstract when you want to force subclasses to provide the implementation. For example, if you write an abstract class Car with a method goUpHill(), you might want to force each subtype of Car to define its own goUpHill() behavior, specific to that particular type of car.
A reference variable marked final can't ever be reassigned to refer to a different object. The data within the object can be modified, but the reference variable cannot be changed. In other words, a final reference still allows you to modify the state of the object it refers to, but you can't modify the reference variable to make it refer to a different object. Burn this in: there are no final objects, only final references. We'll explain this in more detail in Chapter 3. We've now covered how the final modifier can be applied to classes, methods, and variables.
Then you can assign those values at the time the enums are initialized, by passing a value to the enum constructor.