# What are these notations O(1)/O(n)/O(log n)? [duplicate]

I am a newbie here I recently read tutorials on java about collection framework. The time complexity of various objects in reading/writing data What does it mean? what is O notations? can anyone make me understand these notations and about time complexity measures using these notations

• These are known as asymptotic notation, and probably explained in your textbook. Sep 5, 2013 at 11:07
• @YuvalFilmus Could you spend two minutes of your time in explaining these I read but I could not understand. it would be great help Sep 5, 2013 at 11:09
• Sep 5, 2013 at 11:09
• This question is too broad. You aren't asking a question about a specific problem here, but looking for a basic presentation of the subjcet. There are already plenty of such presentations on the internet and in textbooks. Please ask here if you have a specific question: some specific part of the explanations that you don't understand, or a specific problem that you face when trying to apply these notions to a particular case. Sep 5, 2013 at 11:11