Question

我想创建一个包含泛型类字段的Singleton。

并为这些字段使用getter和setter来接收类型。我怎么能这样做？

public class User<U,O> {

   private static final User instance;

   private U userId;
   private O organization;

   private User() {
   }

   public static synchronized User getInstance() {
        if(instance == null){User = new User();}
        return instance;
   }

   //getter and setter for U and O

}

如何在没有施法需要的情况下“按类型”调用Singleton之外的getter和setter？

Answer 1

我认为您只需要输入getInstance()：

尝试：

public class User<U,O> {

   private static final User<> instance;

   private U userId;
   private O organization;

   private User() {
   }

   public static <A, B> synchronized User<A, B> getInstance() {
        if (instance == null) {
            instance = new User<>();
        }
        return instance;
   }

   //getter and setter for U and O

}

在Singleton类中调用Generic字段

1 个答案: