This one list object is biting me in the butt..
Any time I try to add an element to it, it produces this:
Caused by: java.lang.UnsupportedOperationException
at java.util.AbstractList.add(AbstractList.java:148)
at java.util.AbstractList.add(AbstractList.java:108)
The line producing the error is insignificant, but here it is anyways:
AdventureLobbies.players.add(args[0].toLowerCase());
Should I not be accessing it statically?
Actual declaration of variable:
AdventureLobbies.players = Arrays.asList(rs.getString(“players”).toLowerCase().split(“,”));
Any ideas? Can’t find anything on Google that’s worthwhile.
解决方案
Arrays.asList() will give you back an unmodifiable list, and that is why your add is failing. Try creating the list with:
AdventureLobbies.players = new ArrayList(Arrays.asList(rs.getString("players").toLowerCase().split(",")));
Original: https://www.cnblogs.com/sharpest/p/14951105.html
Author: Sharpest
Title: 我无法在列表中添加元素？ UnsupportedOperationException异常(I am unable to add an element to a list? UnsupportedOperationException)
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