Just Java (TM) 2 by Peter van der Linden
By Peter van der Linden
The number 1 advent to J2SE 1.5 and enterprise/server-side improvement! a world bestseller for 8 years, simply Javaa 2 is the total, obtainable Java instructional for operating programmers in any respect degrees. absolutely up to date and revised, this 6th version is greater than an interesting evaluation of Java 2 general version (J2SE 1.5) and its libraries: it is also a pragmatic advent to cutting-edge top company and server-side programming innovations. simply Javaa 2, 6th version, displays either J2SE 1.5 and the newest Tomcat and servlet standards. vast new assurance comprises: *New chapters on generics and enumerated varieties *New insurance of net companies, with sensible examples utilizing Google and Amazon internet prone *Simplified interactive I/O with printf() *Autoboxing and unboxing of primitive forms *Static imports, foreach loop build, and different new language positive factors Peter van der Linden provides specialist recommendation, transparent motives, and crisp pattern courses throughout--including dozens new to this version. alongside the way in which, he introduces: *The center language: syntax, items, interfaces, nested sessions, compiler secrets and techniques, and masses extra *Key libraries: date and calendar, trend matching, community software program, mapped I/O, utilities and typical collections *Server-side expertise: community server structures, an entire tiny HTML net server, and XML in Java *Enterprise J2EE: Sql and JDBCa educational, servlets and JSP and masses extra *Client-side Java: basics of JFC/Swing GUI improvement, new type info sharing detailsCompanion website all of the book's examples and pattern courses can be found at http://afu.com.
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The JDK always knows where to find the Java run-time library classes, but the run-time class loader still needs to know where to find your classes. The first point to note is that you can zip all your class files into a jar file, so you don't really need umpteen levels of directory on the customer's system. A jar file (Java Archive) works exactly like a zip file and can be used to store a whole directory tree in a single file. You can put other files that the application needs, such as image files, sound files, and translations for Strings, in the jar, too.
0. 1, and so on. With floats, we're working with millionths, not tenths. But it is still not perfectly accurate for most numbers. With this background about the limitations, let's review the two floating point types. double The type double refers to floating-point numbers stored in 64 bits, as described in the IEEE standard reference 754. , not integral values). S. professional body. 7E308 with about 15 significant figures of accuracy. The exact accuracy depends on the number being represented.
A parameter is any variable declared within the method signature. The list of parameters is enclosed in parentheses. Each parameter consists of a type name followed by a variable name. In the code fragments shown previously, i is an int parameter to setValue(), and args is a String array parameter to main(). Parameters are sometimes called "formal parameters". Arguments only appear in calls to a method. An argument is the actual value used in a particular call to a function. If we invoke setValue twice like this: Variable-Arity Methods Arity is a computer science term meaning the number of arguments a method or operator takes.