title: Descriptive Statistics from Java ArrayList
body: <p>I have ArrayList of <code>Profile</code> object. <code>Profile</code> have properties like <code>age</code>, <code>gender</code>, <code>country</code>, etc.</p>
  
  <p>Are there any library in java which can give descriptive statistics easily like number of female profile, number of male profile, number of female profile from USA, and other complex report.</p>
  
  <p>The environment used is Google App Engine.</p>
  
  <p>Thanks</p>