Sorted list of contacts having duplicates ,why?

Question

I have sorted and listed my phone contacts in to an arraylist but ,i got many duplicates of same contact names in the list .How this happens? how to avoid this?

This

Answer 1

May be in your contacts having multiple groups, and that group will be a WhatsApp,Google etc..Go to your contacts and search that contact having whatsApp account. will showing double entry with different Group

you should use or change your ContactsBean , in your Bean use HashSet

Note: HashSet can avoid duplicate entry more

HashSet contains unique elements only,it can avoid same key element form HashSet

Example bean

public class ContactBean {
    private HashSet number = new HashSet(); 

    public void setNumber(String number) {
        if (number == null)
            return; 
        this.number.add(number.trim()); 
    }

    public HashSet getNumber() {
        return this.number; 
    }
}

Simple Example

//Creating HashSet and adding elements  
  
  HashSet hashSet=new HashSet();  
  hashSet.add("Dhruv");  
  hashSet.add("Akash");  
  hashSet.add("Dhruv");   //Avoiding this entry   
  hashSet.add("Nirmal");  

 //Traversing elements  
 
  Iterator itr = hashSet.iterator();  
  while(itr.hasNext()){  
   System.out.println(itr.next());
}