Using a jar file in my application... how?

I have a JAR file which contains some classes I need to use in my application. I however, after looking in several books, cannot figure out how to use this JAR file within my application.
Do I simply put it in the directory with my .java files, and use an import command? I'm confused.

If the classes in the jar are part of a package then you can import them based on the package structure. The jar file will have to be part of your CLASSPATH variable.
i.e.
myUtils.jar
resides in C:\"My Classes"
CLASSPATH = .;"C:\My Classes";"C:\My Classes\myUtils.jar"
within the jar I have the following class:
\ameyer\Util\someUtil.class
\ameyer\Util\anotherUtil.class
To use these classes I could use the following import statement
import ameyer.Util.*;
This would import any class at that level in the jar.
Note: the import part of the CLASSPATH is "C:\My Classes\myUtils.jar"
hope this helps.

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[http://www.sdn.sap.com/irj/scn/index?rid=/library/uuid/60d99678-1a29-2d10-94b4-9d9a67b7199b]

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Shay:
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<?xml version="1.0" encoding="utf-8"?>
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<!ELEMENT project (img+)>
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]>
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I was using mail.jar library for swing application to send and receive emails. It just works perfect when I run with netbeans. But when I run the executable jar file at dist folder it runs but mail related functions doesn't work.What should I do now to make it work with mail features outside netbeans.
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Edited by: 899657 on Dec 24, 2011 5:07 AM

899657 wrote:
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Development Tools -> General Questions:
I am trying to figure out how to put utility classes into JAR files and then compile and run applications against those JAR files using the command-line javac, jar, and java tools. I am using jdk1.7.0_17 on Debian GNU/Linux 6.0.7.
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http://holgerdanske.com/users/dpchrist/java/examples/jar-20130520-2134.tar.gz
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2013-05-20 21:39:01 dpchrist@desktop ~/sandbox/java/jar
$ cat src/com/example/util/Hello.java
package com.example.util;
public class Hello {
    public static void hello(String arg) {
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2013-05-20 21:39:12 dpchrist@desktop ~/sandbox/java/jar
$ cat src/com/example/hello/HelloConsole.java
package com.example.hello;
import static com.example.util.Hello.hello;
public class HelloConsole {
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2013-05-20 21:39:21 dpchrist@desktop ~/sandbox/java/jar
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rm -f hello
find . -name '*.class' -delete
javac src/com/example/util/Hello.java
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echo "java -cp src com.example.hello.HelloConsole" > hello
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$ ./hello
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1. Command-line invocation of "jar" to put the utility class bytecode file (Hello.class) into a JAR?
2. Command-line invocation of "javac" to compile the application (HelloConsole.java) against the JAR file?
3. Command-line invocation of "java" to run the application (HelloConsole.class) against the JAR file?
I already know how t compile the utility class file.
Any suggestions?
TIA,
David

I finally figured it out:
1. All name spaces must match -- identifiers, packages, file system, JAR contents, etc..
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My key discovery was that if the code says
import com.example.util.Hello;then the JAR must contain
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http://holgerdanske.com/users/dpchrist/java/examples/jar-20130525-1301.tar.gz
Here is a console session that demonstrates building and running the code two ways:
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(If you don't know Make, understand that the working directory is reset to the initial working directory prior to each and every command issued by Make):
2013-05-25 14:02:47 dpchrist@desktop ~/sandbox/java/jar
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package com.example.hello;
import com.example.util.Hello;
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$ cat libs/com/example/util/Hello.java
package com.example.util;
public class Hello {
    public static void hello(String arg) {
     System.out.println("hello, " + arg);
2013-05-25 14:03:03 dpchrist@desktop ~/sandbox/java/jar
$ make
rm -rf bin ext obj
mkdir obj
cd libs; javac -d ../obj com/example/util/Hello.java
mkdir bin
cd apps; javac -d ../bin -cp ../obj com/example/hello/Console.java
cd bin; java -cp .:../obj com.example.hello.Console
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mkdir -p ext/com/example
cd obj; jar cvf ../ext/com/example/util.jar com/example/util/Hello.class
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adding: com/example/util/Hello.class(in = 566) (out= 357)(deflated 36%)
cd bin; java -cp .:../ext/com/example/util.jar com.example.hello.Console
hello, world!
2013-05-25 14:03:11 dpchrist@desktop ~/sandbox/java/jar
$ tree -I CVS .
|-- Makefile
|-- apps
|   `-- com
|       `-- example
|           `-- hello
|               `-- Console.java
|-- bin
|   `-- com
|       `-- example
|           `-- hello
|               `-- Console.class
|-- ext
|   `-- com
|       `-- example
|           `-- util.jar
|-- libs
|   `-- com
|       `-- example
|           `-- util
|               `-- Hello.java
`-- obj
    `-- com
        `-- example
            `-- util
                `-- Hello.class
19 directories, 6 filesHTH,
David

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Message was edited by: Chemmanz

Hi Chemmanz,
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Oblivious0823 wrote:
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Using a jar file in my application... how?

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