java - 单例中的静态方法

Question

假设我有一个像这样的 Java 类:

public class ClassicSingleton {
   private static ClassicSingleton instance = null;
   protected ClassicSingleton() {
      // Exists only to defeat instantiation.
   }
   public static ClassicSingleton getInstance() {
      if(instance == null) {
         instance = new ClassicSingleton();
      }
      return instance;
   }

   public void initialize(String id, Double num, String data){
       ....
   }

}

如果我要在另一个类中访问 ClassicSingleton 的“实例”，那么理想的方法类型是什么？

应该初始化一个静态函数，以便我可以在其他类中调用它:

ClassicSingleton mySingleton = ClassicSingleton.getInstance();
mySingleton = ClassicSingleton.initialize("id",0.0,"data");

或者我应该保持初始化不变并调用:

ClassicSingleton mySingleton = ClassicSingleton.getInstance();
mySingleton.initialize("id",0.0,"data");

Answer 1

如果您正在访问实例，则使用第二个选项

ClassicSingleton mySingleton = ClassicSingleton.getInstance();
mySingleton.initialize("id", 0.0, "data");