Caused by: java.util.ConcurrentModificationException: null 1、问题:通过增强版得for循环for(ColumnDefinec:columns){if(c.getHeader()==null){columns.remove(c);}}执行之后报Caused by: java.util.Concurre... JAVA 2023-05-11 153 点赞 2 评论 231 浏览