for(int i=0;i<list.size();i++){
  if(list.get(i).equals("del"))
    list.remove(i);
}

int size = list.size();
for(int i=size-1;i>=0;i--){
  if(list.get(i).equals("del"))
    list.remove(i);
}

for(String x:list){
  if(x.equals("del"))
    list.remove(x);
}

//cowlist为原list
CopyOnWriteArrayList<Record> list = new CopyOnWriteArrayList<Record>(cowList);
for(String x:list){
  if(x.equals("del"))
    list.remove(x);
}

Iterator<String> it = list.iterator();
while(it.hasNext()){
  String x = it.next();
  if(x.equals("del")){
    it.remove();
  }
}