参考： https://vladmihalcea.com/the-best-way-to-implement-equals-hashcode-and-tostring-with-jpa-and-hibernate/ https://vladmihalcea.com/how-to-implement-equals-and ...
`参考：[https://www.journaldev.com/21095/java-equals-hashcode](https://www.journaldev.com/21095/java-equals-hashcode)` https://vladmihalcea.com/the-best-way-to ...
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