Java Import Not Working In Package?

I am trying to understand the package and import functions.

The path to access the file " library.book" is

C:UsersKameshDesktopJava SessionJAVAOCA7ooklibrary

and i can see 3 txt files

Book.class
Book.ctxt
Book.java

while compiling i am getting <identifier>expected error.

Here is the code :

package library;
public class Book {
public String isbn;
public void printBook() {}
}
package building;

[Code] .....

The error i get is <identifier>expected.