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SCJP Sun Certified Programmer for Java 5 Study Guide (Exam by Kathy Sierra

By Kathy Sierra

Get the booklet that indicates you not just what to review, yet how to review. the one classroom-based built-in examine approach for pro certification offers whole insurance of all pursuits for the solar qualified Programmer for Java five examination, countless numbers of perform examination questions, and hands-on routines. The CD-ROM positive factors complete perform examination software program plus an adaptive try out engine.

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SCJP Sun Certified Programmer for Java 5 Study Guide (Exam 310-055)

Get the publication that indicates you not just what to review, yet the way to examine. the one classroom-based built-in learn approach for pro certification grants whole assurance of all targets for the solar qualified Programmer for Java five examination, 1000's of perform examination questions, and hands-on routines.

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BIG; } } So what gets created when you make an enum? The most important thing to remember is that enums are not Strings or ints! Each of the enumerated CoffeeSize types are actually instances of CoffeeSize. In other words, BIG is of type CoffeeSize. indd 62 11/28/05 12:25:19 AM CertPrs8/Java 5 Cert. 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.

Println(doRooThings()); //Compiler error! println(doRooThings()); 1 error Although you're allowed to mark instance variables as public, in practice it's nearly always best to keep all variables private or protected. If variables need to be changed, set, or read, programmers should use public accessor methods, so that code in any other class has to ask to get or set a variable (by going through a method), rather than access it directly. JavaBean-compliant accessor methods take the form get or, for booleans, is and set, and provide a place to check and/or validate before returning or modifying a value.

Declaring Reference Variables Reference variables can be declared as static variables, instance variables, method parameters, or local variables. You can declare one or more reference variables, of the same type, in a single line. In Chapter 3 we will discuss the various ways in which they can be initialized, but for now we'll leave you with a few examples of reference variable declarations: Object o; Dog myNewDogReferenceVariable; String s1, s2, s3; // declare three String vars. Instance Variables Instance variables are defined inside the class, but outside of any method, and are only initialized when the class is instantiated.

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