摘要: 一。定义变量1.String "a".var2.int 5.var3.double 5.0.var4.Object new Object.var二。判nulla!=null a.nna==null a.null三。循环1.新循环list.for2.带i的循环list.fori 阅读全文
posted @ 2019-07-11 10:11 zzl0916 阅读(205) 评论(0) 推荐(0) 编辑