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