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Java package 246 Package access protection Classes within a package can access classes and members declared with default access and class members declared with the protected access modifier. Default access is enforced when neither the public, protected nor private access modifier is specified in the declaration. By contrast, classes in other packages cannot access classes and members declared with default access. Class members declared as protected can be accessed from the classes in the same package as well as classes in other packages that are subclasses of the declaring class. Creation of JAR files JAR Files are created with the jar command-line utility. The command jar cf myPackage.jar *.class compresses all .class files into the JAR file myPackage.jar. The ' c ' option on the command line tells the jar command to "create new archive." The ' f ' option tells it to create a file. The file's name comes next before the contents of the JAR file. Package naming conventions Packages are usually defined using a hierarchical naming pattern, with levels in the hierarchy separated by periods (.) (pronounced "dot"). Although packages lower in the naming hierarchy are often referred to as "subpackages" of the corresponding packages higher in the hierarchy, there is no semantic relationship between packages. The Java Language Specification establishes package naming conventions to avoid the possibility of two published packages having the same name. The naming conventions describe how to create unique package names, so that packages that are widely distributed will have unique namespaces. This allows packages to be separately, easily and automatically installed and catalogued. In general, a package name begins with the top level domain name of the organization and then the organization's domain and then any subdomains listed in reverse order. The organization can then choose a specific name for their package. Package names should be all lowercase characters whenever possible. For example, if an organization in Canada called MySoft creates a package to deal with fractions, naming the package ca.mysoft.fractions distinguishes the fractions package from another similar package created by another company. If a US company named MySoft also creates a fractions package, but names it us.mysoft.fractions, then the classes in these two packages are defined in a unique and separate namespace. Complete conventions for disambiguating package names and rules for naming packages when the Internet domain name cannot be directly used as a package name are described in section 7.7 of the Java Language Specification. Core packages in Java SE 6
Java package 247 External links java.lang — basic language functionality and fundamental types java.util — collection data structure classes java.io — file operations java.math — multiprecision arithmetics java.nio — the New I/O framework for Java java.net — networking operations, sockets, DNS lookups, ... java.security — key generation, encryption and decryption java.sql — Java Database Connectivity (JDBC) to access databases java.awt — basic hierarchy of packages for native GUI components javax.swing — hierarchy of packages for platform-independent rich GUI components java.applet — classes for creating and implementing applets • Java SE 6 API Javadocs • Java Language Specification, 3rd Edition, Chapter 7: Packages [4] • Code Conventions for the Java Programming Language, Chapter 9: Naming conventions [5] (mentions packages) • Sun's "Java Tutorials" Lesson: Packages [6] References [1] http:/ / java. sun. com/ docs/ books/ tutorial/ java/ package/ managingfiles. html [2] http:/ / java. sun. com/ docs/ books/ tutorial/ java/ package/ createpkgs. html [3] http:/ / java. sun. com/ docs/ books/ jls/ second_edition/ html/ packages. doc. html#26639 [4] http:/ / java. sun. com/ docs/ books/ jls/ third_edition/ html/ packages. html [5] http:/ / java. sun. com/ docs/ codeconv/ html/ CodeConventions. doc8. html [6] http:/ / java. sun. com/ docs/ books/ tutorial/ java/ package/ index. html
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Contents Articles Java (programming
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Michael Kölling 212 List of Java k
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Java (programming language) 1 Java
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Java (programming language) 3 Stand
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Java (programming language) 5 Examp
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Java (programming language) 7 dialo
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Java (programming language) 9 drawS
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Java (programming language) 11 to s
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Java (programming language) 13 See
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Java (programming language) 15 [41]
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AgentSheets 17 year, per school. Of
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AgentSheets 19 References [1] Cyber
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Lightweight Java 21 Lightweight Jav
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.properties 23 See also • java.ut
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Apache Harmony 25 Sun answered on a
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Apache Harmony 27 Component Descrip
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Apache Harmony 29 [10] Gilbert, Dav
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Apache Shiro 31 Apache Shiro Develo
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Java applet 33 there are frequently
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Java applet 35 } } g.drawString("He
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Java applet 37 The 2002 Sun - Micro
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Java applet 39 [18] W3.org (http:/
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Associació d'Usuaris de Java de Ca
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Bean Scripting Framework 49 Bean Sc
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CJAN 51 Ostensibly, CJAN.org failed
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Chainsaw (log file viewer) 53 Chain
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clone (Java method) 55 Alternatives
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clone (Java method) 57 } } abstract
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Comparison of Java and C Sharp 59 A
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Comparison of Java and C Sharp 61 R
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Comparison of Java and C Sharp 63 T
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Comparison of Java and C Sharp 65 f
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e="6.73"> = 42; = null; Comparison
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Comparison of Java and C Sharp 69 L
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Comparison of Java and C Sharp 71 I
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Comparison of Java and C Sharp 73 t
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Comparison of Java and C Sharp 75 N
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Comparison of Java and C Sharp 77 L
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Comparison of Java and C Sharp 79 T
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Comparison of Java and C Sharp 81 C
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Comparison of Java and C++ 83 C++ J
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Comparison of Java and C++ 85 e="7.
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Comparison of Java and C++ 87 the c
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Comparison of Java and C++ 89 • D
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Comparison of Java and C++ 91 Sever
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Comparison of the Java and .NET pla
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Constant interface 101 } public sta
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Java 4K Game Programming Contest 10
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Java 4K Game Programming Contest 10
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CookXml 107 Creators, setters, adde
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Cougaar 109 Cougaar Cougaar is a Ja
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Devoxx 111 Related links • Devoxx
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Elastic Path 113 References [1] htt
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Electronic Disturbance Theater 115
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Event dispatching thread 117 • Sw
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Facelets 119 The above code can be
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final (Java) 121 } Sphere(double x,
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FormEngine 123 FormEngine Developer
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Generics in Java 125 Motivation for
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Generics in Java 127 Pair grade440
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G-java 129 G-java G-java 2.x was a
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GlassFish Metro 131 Features Metro
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James Gosling 133 Contributions He
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Todd Greanier 135 Todd Greanier Tod
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Head First (book series) 137 Head F
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Inner class 139 • Local class - T
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Interface (Java) 141 The body of th
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Internet Foundation Classes 143 Int
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Internet Foundation Classes 145 •
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JAD (file format) 147 JAD (file for
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JAMWiki 149 JAMWiki Developer(s) Ry
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JGroups 151 JGroups Stable release
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Java Class Library 153 Java Class L
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Java Class Library 155 Alternative
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Java Classloader 157 User-defined c
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Java compiler 159 Java compiler A J
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Java Development Kit 161 • jstack
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Java Interface Definition Language
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Java TV 165 See also • Xlet Exter
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Java Work Framework 167 Database db
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Java annotation 169 programmaticall
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Java annotation 171 component.getAt
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Java collections framework 173 Refe
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Java syntax 175 Java syntax The syn
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Java syntax 177 Double quote \" Tab
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Java syntax 179 import statement Th
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Java syntax 181 switch statement Sw
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Java syntax 183 outer: for (int i =
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Java syntax 185 The catch and final
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Java syntax 187 Reference types Ref
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Java syntax 189 Foo.doSomething();
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Java syntax 191 Modifiers • abstr
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Java syntax 193 } public void walk(
Page 199 and 200: Java syntax 195 Inheritance Interfa
Page 201 and 202: Java syntax 197 /* Any Mapper insta
Page 203 and 204: Java: View Technologies and Framewo
Page 205 and 206: JavaBeans Activation Framework 201
Page 207 and 208: javac 203 References [1] http:/ / j
Page 209 and 210: JavaFX 205 profile includes Swing a
Page 211 and 212: JavaFX 207 External links • Offic
Page 213 and 214: JExamples 209 JExamples Industry Co
Page 215 and 216: Jikes 211 Jikes Developer(s) IBM St
Page 217 and 218: Michael Kölling 213 Microsoft Pate
Page 219 and 220: List of Java keywords 215 case catc
Page 221 and 222: List of Java keywords 217 long nati
Page 223 and 224: List of Java keywords 219 Reserved
Page 225 and 226: Name mangling 221 Name mangling In
Page 227 and 228: Name mangling 223 } }; }; /* = _ZN9
Page 229 and 230: Name mangling 225 if (__1cGstrcmp6F
Page 231 and 232: Name mangling 227 ['_Test__private_
Page 233 and 234: Name mangling 229 External links
Page 235 and 236: Patrick Naughton 231 See also • H
Page 237 and 238: New I/O 233 FileChannel can be used
Page 239 and 240: New I/O 235 // Pattern used to pars
Page 241 and 242: New I/O 237 References [1] "JSR 51:
Page 243 and 244: Omniscient Debugger 239 Omniscient
Page 245 and 246: OpenJDK 241 Inclusion in software d
Page 247 and 248: OpenJDK 243 [12] "Open JDK is here!
Page 249: PHP/Java Bridge 245 References [1]
Page 253 and 254: Parboiled (Java) 249 } } return seq
Page 255 and 256: Plain Old Java Object 251 POJO gene
Page 257 and 258: Pluggable look and feel 253 Pluggab
Page 259 and 260: Primitive wrapper class 255 Primiti
Page 261 and 262: Quark Framework 257 Quark Framework
Page 263 and 264: Quark Framework 259 has proven to p
Page 265 and 266: Quark Framework 261 //illustrates p
Page 267 and 268: Quark Framework 263 As well as LECC
Page 269 and 270: Quark Framework 265 `catch` (\ex ->
Page 271 and 272: REPLAY (software) 267 Qualities REP
Page 273 and 274: Real time Java 269 References [1] J
Page 275 and 276: Restlet 271 Connectors The list of
Page 277 and 278: SLAMD 273 SLAMD The SLAMD Distribut
Page 279 and 280: SLAMD Server 275 SLAMD Server A SLA
Page 281 and 282: Bruno Souza 277 Bruno Souza Born Na
Page 283 and 284: Static import 279 References [1] Ja
Page 285 and 286: strictfp 281 Behaviors and restrict
Page 287 and 288: Sun Web Developer Pack 283 Sun Web
Page 289 and 290: Swing (Java) 285 The Swing Architec
Page 291 and 292: Swing (Java) 287 Relationship to AW
Page 293 and 294: Swing (Java) 289 } window } See als
Page 295 and 296: SwingLabs 291 • JDNC [7] : Contai
Page 297 and 298: Synth Look and Feel 293 Supposing t
Page 299 and 300: TeachScheme! 295 • a function def
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TeachScheme! 297 TeachScheme! and B
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Unified Expression Language 299 Imp
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Java Virtual Machine 301 Bytecode v
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Java Virtual Machine 303 Heap The J
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Xerlin 305 • Steinbrenner, Eugen
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XStream 307 } and add some of these
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Article Sources and Contributors 30
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Article Sources and Contributors 31
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Image Sources, Licenses and Contrib
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