Arrays.asList("1", "2", "3");

回答: 当使用Arrays.asList("1", "2", "3")时，返回的是一个包含三个元素的List对象。这是因为传入的参数是字符串类型，而不是数组。所以它会将每个字符串作为一个独立的元素添加到List中。因此，输出的size将是3。
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