Each holder class has a constructor from an instance, a default constructor, and has a public instance member (value), which is the typed value.

每个holder类都有一个来自实例的构造函数，一个默认的构造函数，以及一个公有的实例成员value，它是一个有类型的值。

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Each holder class has a constructor from an instance, a default constructor, and has a public instance member (value), which is the typed value.

每个holder类都有一个来自实例的构造函数，一个默认的构造函数，以及一个公有的实例成员value，它是一个有类型的值。

youdao