笔试题：编写一个用户注册接口

用户类：UserBean   

用户操作类接口：UserDao

接口实现类：DaoImpl

用户测试类：UserTest

  
public class UserBean{
private String username;
  private String password;
  public UserBean(String name,String password){
    this.username=username;
    this.password=password;
   }
   public void setName(String name){
   this.username=name;
   }
   public String getName(){
   return this.username;
   }
   public void setPass(String pswd){
   this.password=pswd;
   }
   public String getPass(){
   return this.password;
   }
}

public interface UserDao{

public abstract boolean register(UserBean user);

}

public class DaoImpl implements UserDao{

 ArrayList<UserBean> list=new ArrayList<UserBean>();
  public boolean register(Userbean user){boolean flag=true;
       list.add(user);
       return true;
    }

public class UserTesr{
  public static void main(String args[]){
    UserDao ud=new UserDao();
    UserBean user=new UserBean("双双","123456");
    if(ud.register(user)){
         System.out.println"注册成功！");
       }
     else{
      System.out.println("注册失败！");
     }
  }
}