if话语书写习惯

2012-10-06

if语句书写习惯常量写在前面，变量写在后面if(null this.getUserName() && .equals(this.getUserName(

if语句书写习惯
常量写在前面，变量写在后面
if(null == this.getUserName() && "".equals(this.getUserName().trim())){}