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up vote -1 down vote favorite 
Iterator<Object> itr=list.iterator();
while(itr.hasNext()){
Object []obj=(Object[]) itr.next();------------------//line1
JSONObject jo = new JSONObject();
                jo.put("routeNo", (int)obj[6]);
                jo.put("routeName", obj[5].toString());
                jo.put("stopSequenceID", (int)obj[4]);
                jo.put("stopID", (int)obj[3]);
                jo.put("stopName",obj[2].toString());
                jo.put("lat", (double)obj[1]);
                jo.put("lon", (double)obj[0]);
}
java.lang.ClassCastException: java.lang.Double cannot be cast to [Ljava.lang.Object;---------------------at line(1)

I am converting list to Object[].

As 'list' object contains 750 records. with the fields I am putting it on the 'jo' object. Each record contains those 7 fields.

Please help me . Thanks in advance

share|improve this question
1  
Can't be done. An Object is not an Object[]. Perhaps if you explained what you needed to do with it, then we'd be able to help you out a bit better? Also, why you've got a collection of Objects in the first place is a bit bizarre...could you elaborate as to what that collection should contain? –  Makoto Nov 18 '13 at 7:34
    
There is a Double in your list, that's all. –  RC. Nov 18 '13 at 7:35
    
you're trying to cast a double to an array of objects, exactly as the error message says. –  kritzikratzi Nov 18 '13 at 7:35
    
why casting object (which is a Double) to an array of object? –  promanski Nov 18 '13 at 7:36
    
my requirement is while list is iterated those index positions should be set for that key value. –  SriRamaChandra.G Nov 18 '13 at 7:44

2 Answers 2

up vote 0 down vote

itr.next(); Returns an Object in your case. Why are you casting it to Object []?

You probably meant to do something like that:

Iterator<Double> itr=list.iterator();
ArrayList<Double> items = new ArrayList<>();
   while(itr.hasNext()) {
       items.add(itr.next());
   }

Note that defining JSONObject jo shouldn't be inside your while loop.

share|improve this answer
up vote 0 down vote

You can convert List<Double> to Object[] using toArray 

  List<Double> list=new ArrayList<>();
  list.add(10.0);
  list.add(10.0);
  list.add(10.0);

 Object[] obj=list.toArray();
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