JDK1.8新特性(八)：还在重复写空指针检查代码？赶紧使用Optional吧！

Server 2022-01-09 04:10:00 views: null

NoSuchKey

Origin juejin.im/post/6962325858145009672

【优雅代码】03-optional杜绝空指针异常

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