Question

I have changed hashmap into collection,collection into object,now I need object into String.either this way or any better way than this would be really appreciable.

Collection<String> t;
        Collection<String> n;
        String[] names;
        String[] types;
        Object[] foo;
        Object[] doo;
  HashMap<Integer, String> typehashmap=new HashMap<Integer, String>();
           HashMap<Integer, String> namehashmap=new HashMap<Integer, String>();

      t= typehashmap.values();
      n= namehashmap.values();

        foo=t.toArray();
        doo=n.toArray();
      for(int i=0;i<t.size();i++){
 error-->           types[i]=(String) foo[i];
  error-->               names[i]=(String) doo[i];
      }

Answer 1

Assuming that the “error” is an ArrayIndexOutOfBoundsException”, you need to allocate the arrays before you add anything to them. There is also another toArray method that can help:

String[] types = typehashmap.values().toArray(new String[typehashmap.size()]);