How can I make an array list in alphabetical order?

Question

I have an array list in a class that contains the main method, and I want to use Collection.sort (arrayName) way without I need to use another class or interfaces, is it possible? if not, how can I use .sort and I keep my array in the main method?

Answer 1

Code example:
https://code.sololearn.com/c5q0Y3U2176w/?ref=app

Answer 2

You've got an ArrayList that holds customers, so you may write a Comparator for that type, something like:
Comparator<Customer> comp = new Comparator<Customer>() {
@Override
public int compare(Customer c1, Customer c2) {
return c1.getName ().compareTo(c2.getName ());
}
};

Collections.sort(myList, comp);

Answer 3

You can use Collections.sort(myList) as you mentioned. This is a static method, so you don't need an object to call it. It sorts an ArrayList<String> in alphabetical ascending order by default.

Answer 4

See this for explanations on Comparator:
https://docs.oracle.com/javase/7/docs/api/java/util/Comparator.html

Answer 5

Some sorting algorithms encase you're interested:
* Selection sort
* Insertion sort
* Quick sort
* Merge sort
* Tim sort
* bubble sort
* shell sort

Answer 6

@Sooso Sweet ... sorry to intrude....

Can you break your problem down into a task that fits in CodePlayground?
...This is just like a StackExchange "smallest sample case" request except we get a bonus:

Then we can run your code here (at your profile) and people can directly benefit from the solution.

Answer 7

my question is in Java not php *.* ! but thank you

Answer 8

@Kirk Schafer sorry I don't know how to make codes in codePlayground :( but no problem for now I think the problem is solved but I got another problem now 😭 I will try find the solution

@Rrestoring faith yes I have used her code, thanks to her and you! 😊

Answer 9

@Sooso No sorry about my comment I actually thought you were Kirk for a sec asking Tashi to post the code haha. Got confused, my bad.

Answer 10

use bubble sorting algorithm
compare the adjacent string values using string 1.compareTo(string2)

Answer 11

Great demonstration Tashi N

Answer 12

hmm, I think I got it, I will try now 💖

Answer 13

@Tashi N can I have a way to contact you? :( I want to invite you inside my computer so you can see my work and tell me best way to sort my array alphabetically without I change a lot of things, Thank you so much

Answer 14

Am easy way is to import collections class and use the sort method
example: Collections.sort(object);

or else you can use your own sorting algorithm

Answer 15

@Tashi N look what happens when I try to do it :(

https://m.imgur.com/a/BHGov

and thank you so much for helping me ❤
I hope you know what is the problem

Answer 16

hmm sorry I couldn't understand it :(

is Comparator something like Arraylist? and why you have used Override ?

Answer 17

Use the sort method which is present in Collections class.
example:
consider you have created an Arraylist as 'al'.
and you've added all the elements in improper order .so if you want all the elements in order
use Collections.sort(al);.