For adding a utility ‘jar’ file to the project created in Eclipse IDE, refer below steps:
Select the ‘project’.
Right-click the project.
Select ‘properties’.
Select ‘Java build path’.
Select the ‘libraries’ tab.
Select ‘add external jar file’.
Find the location of the ‘jar’ file in your system and add the same to the project.
After this, we can use the functionalities and features related to the jar file in the project.