In that case, a new singleton object will be created.
在这种情况下，一个新的单例对象会被创建。
As a result, instance is now non-null and refers to a valid Singleton object.
结果是，instance现在为非null并引用一个有效的Singleton对象。
The design of this class ensures that only one Singleton object is ever created.
此类的设计确保只创建一个Singleton对象。
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