I have one ArrayList<Users> users_list; and in users i have name, surname, age etc. I want to implement an sorting algorithm that will sort my arraylist based on users age. I searched a lot but found only for sorting arrays.
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2 Answers
Use a custom java.util.Comparator:
public class UserComparator implements Comparator<User> {
@Override
public int compare(User u1, User u2) {
return u1.getAge().compareTo(u2.getAge());
}
}
And sort it like:
Collections.sort(users_list, new UserComparator());
Comments
Take a look here. JavaBeans Comparison. The second answer seems to be more to the point.
I would suggest using http://commons.apache.org/proper/commons-collections/apidocs/org/apache/commons/collections/ComparatorUtils.html#naturalComparator()
as the comparator parameter of the BeanComparator.
