Implement the class
Stack the API of which
can be found here. Use an array in your implementation.
To implement the toString method you have to introduce a recursive helper method.
Include javadoc comments.
If you do the practice labtest at home, download the file practice3.jar (size of this file is 844) and place it in the same directory (folder) as you put type.jar (probably in something like C:\Program Files\Java\jdk1.6.x_yy\jre\lib\ext).