1. // 简单工厂改进
    2. public class DataSimpleFactory {
    4.     public static String db = "";
    6.     public static IUser CreateUser() {
    8.         IUser result = null;
    10.         switch (db) {
    11.         case "SqlServer":
    12.             result = new SqlServerUser();
    13.             break;
    14.         case "Access":
    15.             result = new AccessUser();
    16.             break;
    18.         }
    20.         return result;
    21.     }
    23. }
    24. // 反射
    25. public class DataSQLServerReflection {
    27.     private static final String db = "SqlServer";
    29.     public static IUser CreateUser() throws InstantiationException, IllegalAccessException, ClassNotFoundException{
    30.         return (IUser) Class.forName("com.design.eleven.database.abstractfactory.improve."+db+"User").newInstance();
    31.     }
    33.     public static IDepartment CreateDepartment() throws InstantiationException, IllegalAccessException, ClassNotFoundException{
    34.         return (IDepartment) Class.forName("com.design.eleven.database.abstractfactory.improve."+db+"Department").newInstance();
    36.     }
    38. }
    39. public class DataAccessReflection {
    40.     private static final String db = "Access";
    42.     public static IUser CreateUser() throws InstantiationException, IllegalAccessException, ClassNotFoundException{
    43.         return (IUser) Class.forName("com.design.eleven.database.abstractfactory.improve."+db+"User").newInstance();
    44.     }
    46.     public static IDepartment CreateDepartment() throws InstantiationException, IllegalAccessException, ClassNotFoundException{
    47.         return (IDepartment) Class.forName("com.design.eleven.database.abstractfactory.improve."+db+"Department").newInstance();
    49.     }
    50. }
    51. public class Test {
    53.     public static void main(String[] args) throws InstantiationException, IllegalAccessException, ClassNotFoundException {
    54.         System.out.println("---------使用简单工厂-----------");
    55.         User user =new User();
    56.         Department department =new Department();
    57.         // SQL
    58.         DataSimpleFactory.db = "SqlServer";
    59.         IUser iUser=DataSimpleFactory.CreateUser();
    60.         iUser.Insert(user);
    61.         iUser.GetUser(1);
    62.         // Access
    63.         DataSimpleFactory.db = "Access";
    64.         IUser iUser1=DataSimpleFactory.CreateUser();
    65.         iUser1.Insert(user);
    66.         iUser1.GetUser(1);
    68.         System.out.println("----------使用反射，实例化完返回一个可操作对象------------");
    69.         // SQL
    70.         IUser createUser1 = DataSQLServerReflection.CreateUser();
    71.         IDepartment createDepartment1 = DataSQLServerReflection.CreateDepartment();
    72.         createUser1.Insert(user);
    73.         createUser1.GetUser(1);
    74.         createDepartment1.Insert(department);
    75.         createDepartment1.GetDepartment(1);    
    76.         // Access
    77.         IUser createUser = DataAccessReflection.CreateUser();
    78.         IDepartment createDepartment = DataAccessReflection.CreateDepartment();
    79.         createUser.Insert(user);
    80.         createUser.GetUser(1);
    81.         createDepartment.Insert(department);
    82.         createDepartment.GetDepartment(1);
    84.     }
    85. }