Android studio 如何从一个活动访问一个类到另一个活动

我正在尝试访问“UserGroup”中的对象，例如：user1，但是当我在另一个活动中尝试访问它们时，出现了错误，无法解析符号“user1”和“user2”。有人能告诉我哪里出了问题吗。会帮我大忙的！！下面是我的代码：

public class User {

String userName;
String password;
String favColor;

public  User(String userName, String password, String favColor){
    this.userName = userName;
    this.password = password;
    this.favColor = favColor;

}
public static class UserGroup{
    User user1 = new User ("Jason", "Sword", "Red");
    User user2 = new User ("Billy", "Dinosaur", "Blue");
    User user3 = new User ("Zack", "Elephant", "Black");
    User user4 = new User ("Trini", "Tiger", "Yellow");
    User user5 = new User ("Kimberly", "Bird", "Pink");

}

}

    logInBt.setOnClickListener(new View.OnClickListener() {
        public void  onClick(View view) {

            String userET = userEditText.getText().toString();
            String userPassword = passwordEditText.getText().toString();

            User.UserGroup users = new User.UserGroup();
            if(userET.equals(user1.userName) && userPassword.equals(user1.password)){

                // login to next page

            }else if(userET.equals(user2.userName) && userPassword.equals(user2.password)){

             // login to next page

            }



        }
    });