我可以访问功能的特定数据吗？

我想访问一个类的某个函数的特定数据到另一个类。我可以访问一个类的函数到另一个类，我可以访问它的公共数据吗？

  public class SessionManagement {

          public void createLoginSession(String accesstoken, String tokentype, String expiresin, String username, String masterId, String name, String access, String issued, String expires) {

        editor.putBoolean(IS_LOGIN, true);
        editor.putString(KEY_access_token, accesstoken);
        editor.putString(KEY_token_type, tokentype);
        editor.putString(Key_EXPIRES_IN, expiresin);
        editor.putString(KEY_USERNAME, username);
        editor.putString(KEY_MASTER_ID, masterId);
        editor.putString(KEY_Name, name);
        editor.putString(KEY_Access, access);
        editor.putString(KEY_Issued, issued);
        editor.putString(KEY_expires, expires);
        editor.apply();

        String user_new_access_token; = pref.getString(KEY_access_token, null);
        String user_new_access_tokentype = pref.getString(KEY_token_type, null);
        String user_name_expiresin = pref.getString(Key_EXPIRES_IN, null);
        String user_name_Username = pref.getString(KEY_USERNAME, null);
        String user_name_masterID = pref.getString(KEY_MASTER_ID, null);
        String user_name_name = pref.getString(KEY_Name, null);
        String user_name_access = pref.getString(KEY_Access, null);
        String user_name_issued = pref.getString(KEY_Issued, null);
        String user_name_expires = pref.getString(KEY_expires, null);


        Log.d("TAG", "Access Token :" + accesstoken + user_new_access_token);
        Log.d("TAG", "TokenType:" + user_new_access_tokentype);
        Log.d("TAG", "Expires in:" + user_name_expiresin);
        Log.d("TAG", "UserName:" + user_name_Username);
        Log.d("TAG", "MasterID:" + user_name_masterID);

        Log.d("TAG", "Name:" + user_name_name);
        Log.d("TAG", "Access:" + user_name_access);
        Log.d("TAG", "Issued:" + user_name_issued);
        Log.d("TAG", "Expires:" + user_name_expires);


        //  String user_name_new = pref.getString(KEY_access_token, null);

        //  Log.d("TAG", " :" + accesstoken + " user_name_new:" + user_name_new);


        //  Log.d(tokentype, "admin");
        //ad Log.d(expiresin, "expiresin");

        editor.commit();


    }
  public String getAccesstToken()
    {
        String user_new_access_token = pref.getString(KEY_access_token, null);
        return user_new_access_token;
    }
        }

家庭班

public class Home extends AppCompatActivity{
     SessionManagement sessionManagement;
     protected void onCreate(@Nullable Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
        sessionManagement.createLoginSession();//i can access the function
    String user_new_access_token= sessionManagement.getAccesstToken();
     Log.d("",user_new_access_token);

    }
    }

这里我想访问函数 String user_new_access_token 的数据。我可以通过 .(dot) 运算符访问该函数，但不能访问该函数的数据？为什么不能这样做？它会有所帮助的原因。