weixin_43915873的博客

List转Map

Stream之groupingBy(list分组)的简单应用** public static class Student{ private String name; private String sex; private String age; public String getName() { return name; } public void setName(String na

steam之forEach的用法public static class Student{ private String name; private String sex; private String age; public String getName() { return name; } public void setName(String name) {