程序中，类IntArray 的三个构造函数都是以相似的方式来实现的。一般来说 ，当两个或多个函数重复相同的代码时，可将这部分代码抽取出来，形成独立的函数 ，以便共享。以后如果需要改变这些实现，则只需改变一次，而且这种实现的共享本 质更容易为大家所理解。怎样把构造函数中的代码抽取出来形成独立的共享函数呢？ 请给出一种可能的实现。按你给出的实现方法修改程序并重新编译运行。

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