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itwanger / toBeBetterJavaer

一份通俗易懂、风趣幽默的Java学习指南，内容涵盖Java基础、Java并发编程、Java虚拟机、Java企业级开发、Java面试等核心知识点。学Java，就认准二哥的Java进阶之路😄
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java新属性->Optional最佳指南 ->04、判断值是否存在 示例代码 #75

Closed cfzhangwl closed 5 months ago

cfzhangwl commented 1 year ago

image

itwanger commented 5 months ago

新版已经修正，感谢指出错误。