ServletResponse : getWriter() and getOutputStream()

getWriter() : returns PrintWriter Object that is used for writing character text.

getOutputStream() : returns ServletOutputStream Object used for writing binary data in response.

Mean - Median - Mode

Mean - Median - Mode are three words which I often confuse.

Mean : Average 

• Arithmetic Mean (AM) : (a+b+c+....+n)/n 
•                                                               1/n
• Geometric Mean (GM) : (a*b*c*.....*n)
• 
  
• Harmonic Mean (HM) 

     AM >= GM >= HM

Median : Middle Value

     If we have a set of values, then mean of those can be found by arranging those values in ascending/      descending order and the middle value will be median.

Mode : Most frequently occuring value. Mode may / may not be unique.