Declare that the enclosing method, compare in this example, also throws IOException.

声明包装方法(本例为compare)也抛出IOException。

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method throws an IOException, then the stream will not be closed (until the garbage collector runs its finalizer).

但是如果 props.load() 方法抛出一个 IOException，那么流则不会被关闭（直到垃圾收集器运行其终结器）。

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