轉自：https://www.it1352.com/968919.html

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.

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(",")));

• 機譯

這一個列表物件正在咬我... ...

每當我嘗試新增一個元素時，它就會產生這個：

 由以下原因引起：java.lang.UnsupportedOperationException 
 at java.util.AbstractList.add（AbstractList.java:148)
 at java.util.AbstractList.add（AbstractList.java:108）
  

產生錯誤的行是無關緊要，但無論如何：

  AdventureLobbies.players.add（args [0] .toLowerCase（））; 
  

我是否應該靜態訪問它？

AdventureLobbies.players = Arrays.asList（rs.getString（"players"）。toLowerCase（）。split （"，"））;

任何想法？在谷歌上找不到任何值得的東西。