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Here is what I have been trying to achieve the whole day. I currently have a class which has the attributes for my objects with setters and getters. I have another class where I read my CSV file and put it in a ArrayList. Every row of the file is a object and every column is a attribute which I have assigned and this works when I do a System.out.println.

What I now want to is create a class that can sort the objects by an attribute which is a string. How do I go about to do this as I have been trying all day using Comparators but I have no idea what I am doing.

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  • Show us your code, samples from CSV file. Commented Feb 15, 2015 at 19:56
  • Post your code. Without it we can't show and explain mistake you made. Commented Feb 15, 2015 at 20:09

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Lets say you have a CSV file like this:

John,Smith,28
Jane,Doe,37

Etc, then we have a class Person, something like:

public class Person {
    private String firstName;
    private String lastName;
    private int age;

    //getters and setters

   //equals and hashCode
}

We then read the file, line by line, into a List<Person>. We now want to sort the List by lastName. This can be done like so:

final List<Person> people = readFile();
people.sort(Comparator.comparing(Person::getLastName));
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2 Comments

Do I put this in my main class?
@Logic210 I don't know where you put it. You haven't posted any code.

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