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The Java Packager tool is a tool included in the JDK which allows to package Java applications from the command line. It is an alternative to using other packaging tools like Apache Ant. [1] Note that the Java Packager does not automatically produce a Jar file. Many other formats are available, including native executable formats for the platform.
It is also possible to convert J2ME MIDlet JAR-packages into standalone APK files. [30] J2ME Loader — is an enhanced fork of MicroEmulator for Android. [31] [32] JL-Mod — is an enhaced fork of J2ME Loader with the Mascot Capsule 3D API support. [33] [34]
A JAR ("Java archive") file is a package file format typically used to aggregate many Java class files and associated metadata and resources (text, images, etc.) into one file for distribution. [ 4 ] JAR files are archive files that include a Java-specific manifest file .
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.
The virtual machine will only load the class files required for executing the program. [2] The Java run time system does not need to know about files and file systems as this is delegated to the class loader. A software library is a collection of related object code. In the Java language, libraries are typically packaged in JAR files. Libraries ...
Java bytecode is also converted into an alternative instruction set used by the Dalvik VM. An uncompressed .dex file is typically a few percent smaller in size than a compressed Java archive (JAR) derived from the same .class files. [10] The Dalvik executables may be modified again when installed onto a mobile device.
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These files contain web modules, including servlets, JSP files, HTML files, and other web resources. Each WAR file typically has the following structure: WEB-INF/ web.xml: The deployment descriptor for the web module. classes/: Contains compiled Java classes. lib/: Contains library JAR files used by the web module. RAR Files: These files ...