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The user cannot replace this class name using the invocation java -jar. Class-Path describes the location of supportLib.jar relative to the location of the library helloWorld.jar. Neither absolute file path, which is permitted in -classpath parameter on the command line, nor jar
GNU Classpath is a free software implementation of the standard class library for the Java programming language.Most classes from J2SE 1.4 and 5.0 are implemented. Classpath can thus be used to run Java-based applications.
An executable Java program can be packaged in a JAR file, along with any libraries the program uses. Executable JAR files have the manifest specifying the entry point class with Main-Class: myPrograms.MyClass and an explicit Class-Path (and the -cp argument is ignored). Some operating systems can run these directly when clicked.
The Java Module System was initially being developed under the Java Community Process as JSR 277 and was scheduled to be released with Java 7. JSR 277 later was put on hold and Project Jigsaw [2] was created to modularize the JDK. This JSR was superseded by JSR 376 (Java Platform Module System).
Service providers can be installed in an implementation of the Java platform in the form of extensions, that is, jar files placed into any of the usual extension directories. Providers can also be made available by adding them to the application's class path or by some other platform-specific means.
In the Java language, libraries are typically packaged in JAR files. Libraries can contain objects of different types. The most important type of object contained in a Jar file is a Java class. A class can be thought of as a named unit of code.
The Java Class Library (rt.jar) is located in the default bootstrap classpath [1] and does not have to appear in the classpath declared for the application. The runtime uses the bootstrap class loader to find the JCL.
jdic.jar: JAR file which contains all the Java classes needed for development. It must be in the classpath of the user for compilation. jdic.dll and tray.dll: On Windows installations, these files need to be into the directory where this operating system is installed (normally, C:\Windows). They contain the "bridge" methods between the jdic.jar ...