判断两个数组里是否有相同的数据，用到了containsAll，后来发现，及时有相同的，也返回false。
经排查，原来是A.containsAll(B)，A必须完全包含B才会返回true，即A>=B。
源码：
源码里遍历，只要有一个不存在的，立马会返回false。
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