This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
I am sure that a lot of us have met this nice process when registering our information: suppose there are two categories left for us to choose; one is "country",the other is the "city" of that country. what happens here is:when we select the country,the "city" category can usually correspond to this selection,displaying the cities belonging to that selected country.