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Sometimes it is necessary to do some initialization operation even before a single instance of that class is created. For example, in a class with native method declaration, a native library must be loaded before any of the native methods are called. The best way to load the library before any instance is created is to load it in a static initializer. A static initializer may be replaced by a static method, but a static method needs to be explicitly called to ensure the initialization. The static initializer blocks serve better as they are automatically executed when the class is loaded the first time.