I am storing data in class object from array List like
MyClass[] obj = list.toArray(new myclass[0]);
if i want to append ArrayList data into MyClass object. what should i need to do? i want to do somethink like
obj = obj.append(list);
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what do you want to say exactly?Swapnil– Swapnil2014-05-09 11:59:10 +00:00Commented May 9, 2014 at 11:59
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how can i append to class object from arraylist?Rahul Rawat– Rahul Rawat2014-05-09 12:01:20 +00:00Commented May 9, 2014 at 12:01
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can you elaborate your question and your basic requirement,i will give you any alternative solution.Swapnil– Swapnil2014-05-09 12:03:23 +00:00Commented May 9, 2014 at 12:03
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you can try getter,setter method to add data to your classSwapnil– Swapnil2014-05-09 12:06:45 +00:00Commented May 9, 2014 at 12:06
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i have each time array list and just want to append in exit object.Rahul Rawat– Rahul Rawat2014-05-09 12:07:31 +00:00Commented May 9, 2014 at 12:07
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2 Answers
The length of an array is immutable in java. This means you can't change the size of an array once you have created it. So if you don't know the final size of the array you can't do what you want using Array.
When you do:
MyClass[] obj = list.toArray(new myclass[0]);
You are creating an Array with size=1. Then you can't add elements.
Using List instead of Array could be a good solution.
2 Comments
Rahul Rawat
now i have just two custom class object and want to add both. i mean copy one to another
Jordi Reina
Sorry but I don't see what you mean. You have to different kinds of Objects and you want add one of them to the other. Or same Objects?
I think you are mistaken ArrayList with array.
ArrayList is a raw type meaning it needs parameter to instantiate like:
ArrayList<String> arrayList = new ArrayList<String>();
which creates an empty ArrayList which will contain String.
You can add String by using arrayList.add("Something");. Now your array contains 1 element (String).
On the other hand assuming list is an ArrayList list.toArray() method will return an array (and does not take any argument). I don't think you want something like this.
