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Using jar file in another project

I have one jar file, named pwd.jar and I want to use that in another project named sample.
How can I do that? What are all the steps I should perform?
Note: I am using Eclipse IDE

Right click your project-> properties->Java Build Path -> Libraries tab -> Add External jar, and browse your jar
Cheers

how to add .jar file into android dependencies folder

I have a problem, I need to add a .jar file into android dependencies folder in eclipse. I have looked for similar stack posts but none of them worked for me.
I have tried pasting the jar file into the libs folder but it gives an error
cannot copy the clipboard content into the selected items"
I have to deliver my work by tomorrow. Please help. Thanks in advance

Add it to the classpath, which is specified by the "Java Build Path" menu in the project properties.
More info here: http://help.eclipse.org/juno/index.jsp?topic=%2Forg.eclipse.jdt.doc.user%2Freference%2Fref-properties-build-path.htm

If you're using the ADT plugin for Eclipse, you must add it to your classpath. Simply right-click on your project, choose 'Properties', go to the 'Java Build Path' tab, and, in the 'Libraries' tab, click "Add External JARs" and import your JAR. This will auto-import the file and allow you to use it in your projects.
Your problem may be similar to this one: Difference between Libraries & lib folders ? How do we add jar files to lib folder?

import library to eclipse

I have been trying for hours to import a library to Eclipse. I tried the simplest method that seems to be to copy the folders inside a lib folder inside the project in Eclipse.
Inside the project folder, the folder of the library is lib/org/imgscalr
I am using the code
import static org.imgscalr.*;
What am I doing wrong? I dont know if there is any difference, but I am using a MACBOOK.
I'd like to say that I used the " refresh" and I can see the folder and files there...

If your library is a jar file, then right click the project name and navigate to Build Path.
Select Configure Build Path, and there the Libraries tab. Then choose "Add JAR" or "Add external JAR"(see here and here). The difference between these options is that "Add JAR" is for jars in the project directory, while "Add external JAR" allows for JARs locates anywhere else.
If your "library" is in the form of a folder with classes, follow the steps above but choose "Add Class Folder" instead of "Add JAR".

Eclipse - Importing your own library

Okay, hopefully this is quick and easy.
I have two separate java projects, 'Library' and 'Project', and I have a class in 'Project' that wants to implement a method found in 'Library'. I am looking for some kind of 'import' call to make at the top of my 'Project' class, to make the methods found in 'Library' accessible in that project.
How would I do that?
On another note, this 'Library' project only exists because I want to use a number of classes of my own to supplement the the usual java libraries (java.util, java.io, etc...). Is there a way I can add my java project to my java libraries? (ie. 'import java.Library.className;')
Thanks,
Jonathan

Just have "Project" reference your "Library", on windows the process is (using menu / tab names)
1. Go to: Project -> Properties -> Java Build Path -> Projects
2. Client Add...
3. Select your "Library" project from the list
4. Click Ok
5. Click the other Ok
Now your done and you can use import for classes in your "Library"

There are several ways:
A. Import source files
Right click your project in the project explorer
select
Properties-->Java Build Path
Click on the Source tab and the Link Source button and add the root folder containing Library and click Finish
Now click on the Projects tab and click the Add button to add your 'Library'. Click Ok and you're done
B. Import Jar
When you compile your eclipse project it creates a jar for your project in the 'Build' subfolder of the root directory of your project. To import that in you current project:
Again Right click your project in the project explorer
Select Properties-->Java build Path
Click on the Libraries tab and click Add External JARs. Navigate to the folder containing Library.jar and click Finish and click Ok
You should now be able to import your names from your Library Project

How can I add a .jar to my build path in Eclipse?

I try to do it the following way:
Right click on the name of the project.
Click on Build Path in the drop dawn menu.
Click on "Configure Build Path"
And then I do not know what to do. Should I select "Source", "Projects", "Libraries", "Order and Export"?
In "Libraries" I have "Add JARs..." and "Add External JARs...". What should I select? (I have already a .jar file in the lib folder of my project.)
ADDED:
If I click on "Add JARs" in the "Libraries" tab, I see the "lib" sub-folder but if I go there I do not see my .jar file there (and I know that it is there).

Right click on the jar you want to add.
Build Path > Add to Build Path
You're done.
If you want to add the Library with the Java Build Path view, as you tried you have to use Add JARs. If you copied the library via File System the Project is not in sync. You could press F5 on the selected Project.
If you edit outside of Eclipse a lot, you can enable auto-refresh by going to Window > Preferences menu, then in the Preferences dialog box, select General > Workspace.
Check the Refresh automatically box.

I think you are almost correct in adding the jar files to the Selected Project
Right click on the name of the project.
Click on Properties in the menu.
Click on "Java Build Path"
Then select "Libraries"
In "Libraries" Click "Add External JARs...".(if the jar files exists outside the project)
Else Click "Add Jars" (if the jars Exists within the project)
Once you do this, workspace builds automatically and after that your application is set to use for the development.

Click "Add Jar" and select the jar from your project path.

If the jar is already in you project directory click "Add jar" in the Libraries-tab. If not click "Add external jar".
That should do it.
If your jar does not show up when you click "Add jar" although you have copied it to your project directory you should refresh your project. Just go to your project explorer in eclipse, right click on the project-name and click "Refresh".