Java 设计模式之工厂方法(Factory Method)

Account.java

package com.raysmond.factorymethod;

public interface Account {
 //定义工厂方法创建的对象的接口
 public RoleType getRole();
 public void setAccountId(Integer accountId);
 public Integer getAccountId();
 public void setAccountName(String name);
 public String getAccountName();
}
User.java

package com.raysmond.factorymethod;

public class User implements Account{
 private Integer userId;
 private String userName;

 @Override
 public RoleType getRole() {
  return RoleType.USER;
 }
 
 @Override
 public void setAccountId(Integer accountId) {
  this.userId = accountId;
 }

 @Override
 public Integer getAccountId() {
  return userId;
 }

 @Override
 public void setAccountName(String name) {
  this.userName = name;
 }

 @Override
 public String getAccountName() {
  return userName;
 }

 
}
Admin.java

package com.raysmond.factorymethod;

public class Admin implements Account{
 private Integer adminId;
 private String adminName;
 
 @Override
 public RoleType getRole() {
  return RoleType.ADMIN;
 }
 
 @Override
 public void setAccountId(Integer accountId) {
  this.adminId = accountId;
 }
 
 @Override
 public Integer getAccountId() {
  return adminId;
 }

 @Override
 public void setAccountName(String name) {
  this.adminName = name;
 }
 @Override
 public String getAccountName() {
  return adminName;
 }

}
AccountFactory.java

package com.raysmond.factorymethod;

public interface AccountFactory {
 Account getAccount();
}
UserFactory.java

package com.raysmond.factorymethod;

public class UserFactory implements AccountFactory{

 @Override
 public Account getAccount() {
  return new User();
 }

}
AdminFactory.java

package com.raysmond.factorymethod;

public class AdminFactory implements AccountFactory{

 @Override
 public Account getAccount() {
  return new Admin();
 }

}
RoleType.java

package com.raysmond.factorymethod;

public enum RoleType {
 ADMIN,USER
}
Test.java

package com.raysmond.factorymethod;

public class Test {
 public static void main(String[] args){
  AccountFactory userFactory = new UserFactory();
  User user = (User) userFactory.getAccount();
  
  AccountFactory adminFactory = new AdminFactory();
  Admin admin = (Admin) adminFactory.getAccount();
  
  System.out.println(user.getRole());
  System.out.println(admin.getRole());
 }
}