java - Sorting Objects in ArrayList giving unexpected results -

here record arraylist of objects of type employee. trying sort arraylist based on employeename attribute. unfortunately, gives unwanted results.

public void sortbyname(){            for(int = 0; < salesdatamanager.n; i++){         for(int j = i+1; j < salesdatamanager.n; j++){                           if(record.get(i).getemployeename().comparetoignorecase(record.get(j).getemployeename()) > 0){                                            employee etemp = record.get(i);                 record.add(i,record.get(j));                 record.add(j,etemp);                                 }                                }                }            displayallrecords(); } 

i have gone through other posts in stackoverflow regarding topic , found out of post suggest same way.am doing wrong here?

thanks in advance!

you iterating record list , according condition determining add current element. however, aren't emptying list first, approach inevitably lead duplications.

java, luckily, has built mechanism such sorting - need implement comparator:

public class employeenamecomparator implements comparator<emplyoee> {     @override     public int compare (employee a, employee b) {         return a.getemployeename().comparetoignorecase(b.getemployeename()); } 

and use it:

collections.sort (record, new employeenamecomparator()); 

if you're using java 8, use new cleaner syntax:

collections.sort   (record, (a, b) -> a.getemployeename().comparetoignorecase(b.getemployeename());