java5开始，支持在参数类型后面三个点(String...)，表示此处接受的参数为0到多个Object类型的对象，或者是一个Object[]。
例如我们有一个方法叫做test(String... strings)，那么你还可以写方法test()，但你不能写test(String[] strings)，这样会出编译错误，系统提示出现重复的方法。
可以直接用test()去调用，也可以用去test("aaa")，也可以用test(new String[]{"aaa","bbb"})。
另外如果既有test(String... strings)函数，又有test()函数，我们在调用test()时，会优先使用test()函数。只有当没有test()函数式，我们调用test()，程序才会走test(String... strings)。
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