以一种方法的两种数据库实现为例子.
第一种：抽象工厂
package com.wzs.three;
/**
* 大话设计模式--page128 抽象工厂
*
* @author Administrator
*
*/
public class AbstractFactory {
public static void main(String[] args) {
// IFactory factory = new SqlServerFactory();
IFactory factory = new AccessFactory();
User user = new User();
IUser iu = factory.createUser();
iu.insert(user);
iu.getUser(1);
Department department = new Department();
IDepartment id = factory.createDepartment();
id.insert(department);
id.getDepartment(1);
}
}
/*
* 用户
*/
class User {
private int id;
private String name;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
/*
* 部门
*/
class Department {
private int id;
private String name;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
/*
* 抽象工厂
*/
interface IFactory {
IUser createUser();
IDepartment createDepartment();
}
/*
* sql 工厂
*/
class SqlServerFactory implements IFactory {
@Override
public IUser createUser() {
return new SqlServerUser();
}
@Override
public IDepartment createDepartment() {
return new SqlServerDepartment();
}
}
/*
* access 工厂
*/
class AccessFactory implements IFactory {
@Override
public IUser createUser() {
return new AccessUser();
}
@Override
public IDepartment createDepartment() {
return new AccessDepartment();
}
}
/*
* 用户方法抽象接口
*/
interface IUser {
void insert(User user);
User getUser(int id);
}
/*
* sql用户方法
*/
class SqlServerUser implements IUser {
@Override
public User getUser(int id) {
System.out.println("在sql server中得到id=" + id + "的User记录.");
return null;
}
@Override
public void insert(User user) {
System.out.println("在sql server中插入User新记录.");
}
}
/*
* access用户方法
*/
class AccessUser implements IUser {
@Override
public User getUser(int id) {
System.out.println("在Access中得到id=" + id + "的User记录.");
return null;
}
@Override
public void insert(User user) {
System.out.println("在Access中插入新User记录.");
}
}
/*
* 部门抽象方法接口
*/
interface IDepartment {
void insert(Department department);
Department getDepartment(int id);
}
/*
* sql部门方法
*/
class SqlServerDepartment implements IDepartment {
@Override
public Department getDepartment(int id) {
System.out.println("在sql server中得到id=" + id + "的Department记录.");
return null;
}
@Override
public void insert(Department department) {
System.out.println("在sql server中插入新Department记录.");
}
}
/*
* access部门方法
*/
class AccessDepartment implements IDepartment {
@Override
public Department getDepartment(int id) {
System.out.println("在Access中得到id=" + id + "的Department记录.");
return null;
}
@Override
public void insert(Department department) {
System.out.println("在Access中插入新Department记录.");
}
}
第二种：反射+抽象工厂
package com.wzs.two;
/**
* 大话设计模式--page128 反射+抽象工厂
*
* @author Administrator
*
*/
public class AbstractFactory {
public static void main(String[] args) throws InstantiationException, IllegalAccessException, ClassNotFoundException {
// IFactory factory = new SqlServerFactory();
User user = new User();
IUser iu = DataAccess.createUser();
iu.insert(user);
iu.getUser(1);
Department department = new Department();
IDepartment id = DataAccess.createDepartment();
id.insert(department);
id.getDepartment(1);
}
}
class DataAccess {
private static String db = "Access";
public static IUser createUser() throws InstantiationException, IllegalAccessException, ClassNotFoundException {
return (IUser) Class.forName("com.wzs.two." + db + "User").newInstance();
}
public static IDepartment createDepartment() throws InstantiationException, IllegalAccessException, ClassNotFoundException {
return (IDepartment) Class.forName("com.wzs.two." + db + "Department").newInstance();
}
}
class DataSqlServer {
private static String db = "SqlServer";
public static IUser createUser() throws InstantiationException, IllegalAccessException, ClassNotFoundException {
return (IUser) Class.forName("com.wzs.two." + db + "User").newInstance();
}
public static IDepartment createDepartment() throws InstantiationException, IllegalAccessException, ClassNotFoundException {
return (IDepartment) Class.forName("com.wzs.two." + db + "Department").newInstance();
}
}
/*
* 用户
*/
class User {
private int id;
private String name;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
/*
* 部门
*/
class Department {
private int id;
private String name;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
/*
* 用户方法抽象接口
*/
interface IUser {
void insert(User user);
User getUser(int id);
}
/*
* sql用户方法
*/
class SqlServerUser implements IUser {
@Override
public User getUser(int id) {
System.out.println("在sql server中得到id=" + id + "的User记录.");
return null;
}
@Override
public void insert(User user) {
System.out.println("在sql server中插入User新记录.");
}
}
/*
* access用户方法
*/
class AccessUser implements IUser {
@Override
public User getUser(int id) {
System.out.println("在Access中得到id=" + id + "的User记录.");
return null;
}
@Override
public void insert(User user) {
System.out.println("在Access中插入新User记录.");
}
}
/*
* 部门抽象方法接口
*/
interface IDepartment {
void insert(Department department);
Department getDepartment(int id);
}
/*
* sql部门方法
*/
class SqlServerDepartment implements IDepartment {
@Override
public Department getDepartment(int id) {
System.out.println("在sql server中得到id=" + id + "的Department记录.");
return null;
}
@Override
public void insert(Department department) {
System.out.println("在sql server中插入新Department记录.");
}
}
/*
* access部门方法
*/
class AccessDepartment implements IDepartment {
@Override
public Department getDepartment(int id) {
System.out.println("在Access中得到id=" + id + "的Department记录.");
return null;
}
@Override
public void insert(Department department) {
System.out.println("在Access中插入新Department记录.");
}
}