Reorder the list

Like I have a javabean://department class public class territory{   private int id;    private string territoryname;   public void setid (Int id) {        this.id = id;   }   public  Int getid () {       return id;   }    public void setterritoryname (String territoryname) {        this.territoryname = territoryname;   }   public string  getterritoryname () {       return territoryname;    }} a Business class:public class datamigrationdao{    territory t1 =  New territory ();     t1.setid (5);     t1.setterritoryname ("T1");      terriTory t2 = new territory ();      t2.setid (1);      t2.setterritoryname ("T2");     territory t3 = new  Territory ();      t2.setid (3);      t2.setterritoryname ("T3");        List<Territory> list = new ArrayList< Territory> ();       list.add (t1);       list.add ( T2);       list.add (T3);       //now sort the list collection in ascending order       collections.sort (List, new compareunit ());       .....      //will reorder the list to persist other operations such as}//inner class//This is ascending, if you want to descending, put the if (.. (...) {return -1} if (.. &lt, ...) {Return 1} return 0class compareunit implements comparator<territory>{     @Override     public int compare (Territory t1 ,  territory t2)  {        if (T1.getId () <t2.getId ()) {             return -1;         }        if (T1.getId () >t2.getId ()) {             return 1;         }           return 0;     }   }

Reordering the list