sort alphanumeric arraylist in ascending order

Question

how to sort arraylist having elements like

02112-S1530   
02112-S1529  
02112-S1531

in ascending order.

i am using Collection.sort(List name);
but getting output

02112-S1531  
02112-S1529   
02112-S1530

Expected output is:

02112-S1529  
02112-S1530   
02112-S1531

i did like

List<String> gbosIdsList = new ArrayList<String>();
gbosIdsList.add("02112-S1530");
gbosIdsList.add("02112-S1529");
gbosIdsList.add("02112-S1531");
Collections.sort(gbosIdsList);
Iterator itr = gbosIdsList.iterator();
  while(itr.hasNext()){
      System.out.println(itr.next());           
}

You need to define your own `comapartor`.There you can modify the comparison criteria for sorting.. — Anubhab, Mar 19 '13 at 10:03
s thats true. But i dont have that much time to learn and solve this.. please help me.. i tried with sorted set also..but vain.. — user1912935, Mar 19 '13 at 10:09
@user1912935 your code is working fine for me. try to clean the project and try again. :) — PermGenError, Mar 19 '13 at 10:11
doesn't any body realize the code actually works. I have tried it and get the OP's desired output . — PermGenError, Mar 19 '13 at 10:15
@PermGenError i clean and built the project again but no use. — user1912935, Mar 19 '13 at 10:22
Yes..the code works fine..but for more control over sorting you can use comparator.. — Anubhab, Mar 19 '13 at 10:22
Sorry for troubling you all. the issue is with the space. i used trim before adding the elemants into arraylist.Now it is working fine.. — user1912935, Mar 19 '13 at 10:38

score 1 · Accepted Answer · answered Mar 19 '13 at 10:04

1

I tried your code and got the output:

02112-S1529
02112-S1530
02112-S1531

Also, you have make your iterator generic

Generics 101: don't use Raw type in new code

Iterator<String> itr = gbosIdsList.iterator();

answered Mar 19 '13 at 10:04

PermGenError

45,977
8
87
106

Please look here: http://stackoverflow.com/questions/11176227/simple-way-to-sort-strings-in-the-alphabetical-order – Michael Mar 19 '13 at 11:04

score 0 · Answer 2 · answered Mar 19 '13 at 10:12

Define a comparator like this

public class MyComparator implements Comparator<String> {

    /* (non-Javadoc)
     * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
     */
    @Override
    public int compare(String arg0, String arg1) {
        //Do your processing here 
        //and
        //return +1 if arg0 > arg1
        //return 0 if arg0 == arg1
        //return -1 if arg0 < arg1
        return 0;
    }

}

Then add this to your sort

List<String> gbosIdsList = new ArrayList<String>();
//add values
Collections.sort(gbosIdsList,new  MyComparator());

FYR you can read this

sort alphanumeric arraylist in ascending order

2 Answers2