Difficulty in updating the list object values

Question

I have created a list with Objects(MyVertex). I am trying to update the list based on the condition . Instead it adds duplicate values. The simple logic is (if the object is already in the list )only update the values or add to the list (Object) Please help me how can I correct my code.
public static void updateResult(MyVertex c)
          Iterator it2=result.iterator();
          while(it2.hasNext())
               //System.out.println( "Result to be added : "+c.getName());
               j=(MyVertex)it2.next();
               if(j.getName().equals(c.getName()))
                    j.setWeight(c.getWeight());
                    break;
               //System.out.println( "Result item name : "+j.getName());
          result.add(c);
     }Thanks a lot .

Answer 1

Thank you all for your immediate reply. It has solved half of my problem.Now It is not adding all "c" ,but it still not updating the value if the matching found.
public static void updateResult(MyVertex c)
          Iterator it2=result.iterator();
          while(it2.hasNext())
               //System.out.println( "Result to be added : "+c.getName());
               j=(MyVertex)it2.next();
               if(j.getName().equals(c.getName()))
                    j.setWeight(c.getWeight());
                    flag=true;
                    return;
               //System.out.println( "Result item name : "+j.getName());
          if(!flag)
          {result.add(c);}
     }