由于题目数据范围来到了1000，那么肯定不能用n^3的方法暴力枚举每一个数，因此，只能想办法优化掉一层循环。 由于题目的要求与顺序无关，所以可以考虑对数组进行从小到大排序。对数组排序后，我们枚举第一个数x，那么就只要找到与另外两个数的和k=target-x ...

为了简化数组的操作，Java 提供了一个 工具类 Arrays ，它包含了 大量的静态方法 ，用于处理数组的常见任务，如排序、查找、填充、比较等。该类属于 java.util 包，所有方法都是静态的，因此可以直接通过类名调用。

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This article presents links to and descriptions of built-in operators and functions for strings and binary types, numeric scalars, aggregations, windows, arrays, maps, dates and timestamps, casting, ...