How do I convert names to numbers to implement sorting and maintain consistency in groups?

Name numerical conversion sorting: a way to maintain group consistency

When it is necessary to sort users, especially when users belong to multiple groups, it is crucial to maintain the consistency of user sorting within each group. For example, we need to convert the following names to numbers used for sorting:

 <code>jack -> 75900张三-> 66640李四-> 54840</code>

Although it is only possible to use name strings to sort directly, it may be more convenient to convert names to numbers in certain specific application scenarios. An effective way is to take advantage of the hash value of a string.

Using the hash value of a string directly (for example, string.hashCode() ) can get an integer, but the integer may be too large or negative. To solve this problem, we can use modulo operation to limit the range of numbers and use bit operation to ensure that the result is positive.

One way is to get the mold directly:

 s.hashCode() % 100000

This will generate an integer between 0 and 99999. But this method may produce negative numbers. To ensure that the result is a positive number, bit operations can be used:

 (s.hashCode() & 0x7fff) % 100000

or

 (s.hashCode() % 100000) & 0x7fff

These methods can convert the string hash value into a smaller positive integer, thereby realizing the name-to-number conversion and ensuring that the numbers of the same name remain consistent in different groups for easy sorting. Selecting the appropriate modulus (eg, 100,000) can control the generated number length.

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