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

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!

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: