因为根据设计它是线程安全的，创建它之后可以把它缓存在一个公共静态最终变量中，或者包装在单实例模式中以供以后访问。

Since it is thread safe by design, you might cache it in a public static final variable, or wrap it in a singleton pattern after creation for later access.

youdao

单例模式可能是最常用的OOP设计模式之一了；它限制了一个类的对象实例数只能为1。

The singleton pattern is probably one of the most often used OOP design patterns; it restricts the number of object instances of a class to one.

youdao

单例模式是一种非常有用的设计模式，它允许你的类对外只提供一个实例，但是常犯的错误在于不止一个实例被创建。

The singleton is a useful design pattern for allowing only one instance of your class, but common mistakes can inadvertently allow more than one instance to be created.

youdao