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 ...

Creating simple data classes in Java traditionally required substantial boilerplate code. Consider how we would represent Java’s mascots, Duke and Juggy: public class JavaMascot { private final String ...

It's not terribly clean, but you could use indexOf() and check if it returns -1. Better than breaking out a loop.