Java Certification Scjp Certified Programmer For Java 5 by Kathy Sierra

By Kathy Sierra

Get the e-book that indicates you not just what to review, yet how to check. the one classroom-based built-in learn procedure for pro certification promises whole assurance of all goals for the sunlight qualified Programmer for Java five examination, hundreds of thousands of perform examination questions, and hands-on routines. The CD-ROM gains complete perform examination software program plus an adaptive try out engine.

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Extra info for Java Certification Scjp Certified Programmer For Java 5 Study Guide Exam 310 055 Sun

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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.

In other words, all instances of a given class share the same value for any given static variable. 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.

X); ^ 1 error So far we've established that a protected member has essentially package-level or default access to all classes except for subclasses. We've seen that subclasses outside the package can inherit a protected member. indd 35 11/28/05 12:24:42 AM CertPrs8/Java 5 Cert. StudyGuide/Sierra-Bates/225360-6/Chapter 1 36 Chapter 1: Declarations and Access Control outside the package can't use a superclass reference to access a protected member. For a subclass outside the package, the protected member can be accessed only through inheritance.

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