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Full Discussion: Classpath of JAVA
Top Forums Programming Classpath of JAVA Post 302755071 by yifangt on Friday 11th of January 2013 05:50:37 PM
Old 01-11-2013
Classpath of JAVA

Hello,
ABC question as I could not get a direct answer: How to locate the default IO class of JAVA? My question was triggered by the row in most java program
Code:
import java.io.*

as I am very curious where the io class is located in my Mint14 (Ubuntu12.10). I am aware it is similar to use DBI in PERL, or #include <stream> in C++, where I could locate the packages/libraries in certain directories:
Code:
/usr/lib/perl5/DBI.pm
/usr/include/c++/4.7/iostream

but I could not locate any file name (io.class, or io.jre) for this io class in java? Have checked my system for the libraries:
Code:
/usr/lib/jvm/java-7-openjdk-amd64/lib/
/usr/lib/jvm/java-7-openjdk-common/jre/lib/
/home/kevin/downloadsoftware/jre1.7.0_10/lib/
/usr/lib/eclipse/plugins/

Also checked Oracle website, where there is:
Code:
package java.io

but I could not find this file in my system, and the java program works fine. Can anybody give me some explanantion about the "default IO, file, string, date & time, etc classes" of java1.7.x when it was installed. My java is:
Code:
$java -version
java version "1.7.0_09"
OpenJDK Runtime Environment (IcedTea7 2.3.3) (7u9-2.3.3-0ubuntu1~12.10.1)
OpenJDK 64-Bit Server VM (build 23.2-b09, mixed mode)

Thanks a lot!
 

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JH_MANIFEST(1)							    Javahelper							    JH_MANIFEST(1)

NAME
jh_manifest - Adds or/and modifies manifests for jars SYNOPSIS
jh_manifest [debhelperoptions] [options] jar1 ... jarN jh_manifest [debhelperoptions] [options] DESCRIPTION
Javahelper tool to add or update manifests in a jar file. It can be used in two modes. If passed jar files, it will only process these jar files. Otherwise it will update all jar files in the packages it acts on. When processing a package, the debhelper(7) exclude option will make jh_manifest ignore matching jar files. FILES
debian/package.manifest (or debian/manifest) This file consist of a list of jar files and values to add to their manifests. Values in this file will take precedence over values in the original manifest (and command line arguments over values in this file). It is allowed to list a link in this file instead of an actual jar file, provided that the link can be resolved when jh_manifest processes it. If a jar file is listed here cannot be found, jh_manifest will print a warning, unless the jar file has been excluded. As of javahelper >= 0.32, you may add comments in this file. If the line starts with a "#" it is completely ignored. This file is ignored if jh_manifest is passed jar files via command line. OPTIONS
-c classpath, --classpath=classpath Sets the Class-Path attribute of all processed jar files to classpath. If not passed, then the CLASSPATH environment variable will be used in the given jar file do not have a Class-Path attribute. -m class, --main=class Sets the Main-Class attribute to class in all processed jar files. -o options, --javaopts=options Sets the Debian-Java-Parameters to options in all processed jar files. This attribute is used by jarwrapper to start java with extra options (e.g. to make more memory available). -j /path/to/java/home, --java-home=/path/to/java/home Sets the Debian-Java-Home attribute to /path/to/java/home in all processed jars. This attribute is used by jarwrapper to determine which JVM to use. EXAMPLES
An example debian/manifest file: # use the symlink so we do not have to update with the next upstream release. usr/share/java/my.jar: Class-Path: dep1.jar dep2.jar Main-Class: some.awesome.Class usr/share/java/dep2.jar: Class-Path: dep1.jar SEE ALSO
debhelper(7) This program is a part of javahelper and uses debhelper as backend. There are also tutorials in /usr/share/doc/javahelper. AUTHOR
Niels Thykier <niels@thykier.net> COPYRIGHT AND LICENSE
Copyright 2010 by Niels Thykier This tool is free software; you may redistribute it and/or modify it under the terms of GNU GPL 2. 0.43 2012-03-12 JH_MANIFEST(1)
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