Array.aslist () Note

Api:

aslist (T ... a)

Returns a list of fixed sizes supported by the specified array. (Changes to the returned list are "directly written" to the array.) This approach Collection.toArray() , together, serves as a bridge between an array-based API and an collection-based API. The returned list is serializable and implemented RandomAccess .

This method also provides a convenient way to create a fixed-length list that is initialized to contain multiple elements:

Parameters:

a-Arrays of supported lists.

Return:

Specifies the list view of the array.

Problems encountered:

java.lang.UnsupportedOperationException

A java.lang.UnsupportedOperationException exception occurred when calling Add,remove these method after using Arrays.aslist ().

Reason:

This is because Arrays.aslist () returns java.util.arrays$arraylist instead of ArrayList.

Arrays$arraylist and ArrayList are inherited Abstractlist,remove,add etc. method in Abstractlist is the default throw Unsupportedoperationexception and does not do anything.

ArrayList override these method to manipulate the list, but Arrays$arraylist does not override remove (), add (), etc., so the throw Unsupportedoperationexception.

Workaround:

String[] arr ={"A","B","C"};

list<string> list = Arrays.aslist (arr);

list<string> arrlist = new arraylist<string> (list);

Array.aslist () Note