分类：统计个数

2020
10-10

java8 集合 多字段 分组 统计个数代码

1.user实体packagecom.demo.dto;publicclassUser{privateIntegerid;privateStringuserName;privateStringpassword;privateIntegerage;privatelongc;publicUser(){super();//TODOAuto-generatedconstructorstub}publicUser(Integerid,StringuserName,Stringpassword,Integerage){super();this.id=id;this.userName=userName;this.password=password... 继续阅读 >