No enclosing instance of type FactoryModel is accessible. Must qualify the allocation with an enclos

原来我写的内部类是动态的，也就是开头以public class开头。而主程序是public static class main。在Java中，类中的静态方法不能直接调用动态方法。只有将某个内部类修饰为静态类，然后才能够在静态类中调用该类的成员变量与成员方法。所以在不做其他变动的情况下，最简单的解决办法是将publicclass改为public static class.顺带着记录工厂模式的升级版：注意各个类局采用分开创建package cn.factoryModel;public class FactoryModelTest {publicstatic void main(String[]args) {SendFactory factory =new SendFactory();Sender sender =factory.produceMail();sender.Send();sender =factory.produceSms();sender.Send();return;}}package cn.factoryModel;public class SendFactory {// 升级之前的代码是// public Sender producer(String type) {// if ("mail".equals(type)) {// return new MailSender();// } else if ("sms".equals(type)) {// return new SmsSender();// } else {// System.out.println("请输入正确的类型：sms 或者 mail");// return null;// }// }//升级之后的代码 ：提高了确定性 ，避免了输入类型的不匹配public Sender produceMail (){returnnew MailSender();}public Sender produceSms(){returnnew SmsSender();}}package cn.factoryModel;public class MailSenderimplements Sender {@Overridepublicvoid Send() {System.out.println("this is mailsender!");}}package cn.factoryModel;public class SmsSenderimplements Sender{@Overridepublicvoid Send() {System.out.println("this is a smssender!");}}