How to use libraries for Algorithms part I Coursera course in Eclipse

Question

I've started Coursera Algorythms course. Practice assignments must be done on Java and they suggest using DrJava as IDE, but it's really unconvenient. So I'd like to use Eclipse, but the problem is that I couldn't use 2 libraries(algs4.jar and stdlib.jar), which are provided for this course. After doing steps from this guide I was able to include them in my project:

but when I try to use their classes in my project, Eclipse doesn't allow to do it, and I couldn't import them by Ctrl + Space:

And even when I am trying directly import class like import stdlib.StdRandom; it still doesn't work.

What can I do to make it work properly?

Answer 1

Why don't you use these two JARs—— stdlib-package.jar and algs4-package.jar.

And below the code page(http://algs4.cs.princeton.edu/code/)

Q. If I use a named package to structure my code, the compiler can no longer access the libraries in stdlib.jar or algs4.jar. Why not?

A. The libraries in stdlib.jar and algs4.jar are in the "default" package. In Java, you can't access classes in the default package from a named package. If you need to use our libraries with a named package, you can use these package versions: stdlib-package.jar and algs4-package.jar.

Warning: if you are taking Princeton COS 226 or Coursera, Algorithms, Part I or II, you must use the default package verison of our libraries to facilitate grading.

Showing my test success:

Answer 2

You can't access the APIs because the authors have defined them in the default package and Java doesn't recognize these. The authors mention on their website (http://algs4.cs.princeton.edu/code/) that if you are using these in named packages, configure your build path to include the jar from http://algs4.cs.princeton.edu/code/algs4.jar.

HTH!