With ordinary, non-static data and methods you must create an object and use that object to access the data or method, since non-static data and methods must know the particular object they are working with.

• 而在这之前，对于非static数据和方法，我们必须创建一个对象，并用那个对象访问数据或方法。 这是由于非static数据和方法必须知道它们操作的具体对象。