Map集合

List<Map> list = new ArrayList<>();
Map<String,Object> fieldMap = new HashMap<>();
fieldMap.put("user_name","admin");
fieldMap.put("dept_id","100");
//获取所有的key
for (String s : fieldMap.keySet()) {
    System.out.println(s);
}
//获取所有的value
for (Object s : fieldMap.values()) {
    System.out.println(s);
}
//设置value值
for (Map.Entry s : fieldMap.entrySet()) {
    s.setValue("ces");
}
//
for (Object s : fieldMap.values()) {
    System.out.println(s);
}

运行结果

user_name
dept_id
admin
100
ces
ces