CODEWITHSUNDEEP
javacollections
user1912935
user1912935

Reputation: 381

sort alphanumeric arraylist in ascending order

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());           
}

Upvotes: 1

Views: 5751

Answers (2)

Anubhab
Anubhab

Reputation: 1786

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

Upvotes: 0

PermGenError
PermGenError

Reputation: 46408

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();

Upvotes: 1

Related Questions