java - 静态惰性初始化器

Question

我有一个配置服务器的类。服务器对象是静态的并且是延迟初始化的。问题是，服务器的一些配置来自包含类的非静态成员变量。显然，非静态成员是无法访问的。有没有办法解决这个问题，我可以使用非静态变量配置我的服务器？服务器必须保持静态。

public class ClassA {

private static MyServer myServer;
private int a;
private int b;

public ClassA(int a, int b) {
    this.a = a;
    this.b = b;
}

public static MyServer getMyServer() {

    if(myServer == null) {
        myServer = configureServer();
    }

    return myServer;
}

private static MyServer configureServer() {
    MyServer myServer = new MyServer();
    myServer.setaPlusB(a + b);

    return myServer;
}

}

public class MyServer {

    private int aPlusB;

    public void setaPlusB(int aPlusB) {
        this.aPlusB = aPlusB;
    }
}

Answer 1

根据你的问题，我的理解如下；

public class Server {

   private class ServerImpl {

       private int ab;

       public ServerImpl() {

           ab = Server.a + Server.b;
       }
   }

   private static int a;
   private static int b;
   private static ServerImpl s;

   static {

      a = 10;
      b = 10;
   }

   public static ServerImpl getServer(int newA, int newB) {

       a = newA;
       b = newB;
       return getServer();
   }

   public static ServerImpl getServer() {

       if (s == null) {
          s = new ServerImpl();
       }
       return s;
   }
}