finished for 11.12.2013
writing task transfer of Input/Output after   checking
finished 12.12.2013
adding RuntaimExcepion to methods next() end previous().
complite second task of Collections before chech
adding test for task 2.1 of Object in Java
adding test for task 3.2 of Introducing Java
adding task 2.3 of Testing
adding task 1 and 2 of Testing with mocks
adding task 1 and 2 by Testing with mocks