weixin_45739720的博客

1、在pom.xml中添加依赖包 <dependency> <groupId>cn.hutool</groupId> <artifactId>hutool-core</artifactId> <version>4.3.1</version> </dependency>2、创...

1、创建entity（User.java）package com.jeff.entity;public class User { private String userName; private String password; private Integer age; public User() { super(); } public User(String user...

1、创建测试类（TestMap2.java）package com.jeff;import java.util.HashMap;import java.util.Map;public class TestMap2 { public static void main(String[] args) { Map<String, Object> map = new Hash...

1、创建测试类（TestMap1.java）package com.jeff;import java.util.HashMap;import java.util.Map;public class TestMap1 { public static void main(String[] args) { Map<String, Object> map = new Hash...