ArrayList al=null 和ArrayList al=new ArrayList()有什么区别
7条回答 默认 最新
- threenewbee 2016-10-28 15:43关注
ArrayList al=new ArrayList();相当于ArrayList al;al = new ArrayList();
而ArrayList al;相当于ArrayList al = null;解决 无用评论 打赏 举报
ArrayList al=null 和ArrayList al=new ArrayList()有什么区别
ArrayList al=new ArrayList();相当于ArrayList al;al = new ArrayList();
而ArrayList al;相当于ArrayList al = null;