map转list

第一种：遍历map，取出map的value放到List中

List list = new ArrayList();
Iterator it = map.keySet().iterator();
while (it.hasNext()) {
String key = it.next().toString();
list.add(map.get(key));
}

第二种：直接创建ArrayList<>时将map的值放进去

List<InventoryModel> list = new ArrayList<InventoryModel>();

Iterator<InventoryModel> invIterator = list.iterator();Map<String,InventoryModel> map = new HashMap<String, InventoryModel>();
while(invIterator.hasNext()){

InventoryModel in = invIterator.next();

  if(!map.containsKey(in.getProductCode())) {
map.put(in.getProductCode(),invery);
}else{
Float qty = map.get(invery.getProductCode()).getBigQty();
invery.setBigQty(qty +in.getBigQty());
map.put(in.getProductCode(),invery);
}}
list = (new ArrayList<InventoryModel>(map.values()));
}