title: Regarding Adding libraries in Eclipse
body: <p>In eclipse, I am trying to add some libraries. I choose 
  "build path->configure build path->libraries". The right column of the "java build path" window gives me several options: 
  Add JARS, Add External JARS, and Add Library.</p>
  
  <p>It seems to me that I should choose "Add Library", but what do the other two work for, "Add JARS" and "Add External JARS". What are the differences among these three options?</p>