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
IDEA智能快捷键
原文：https://www.cnblogs.com/zzl0916/p/11168328.html
