【轉】jdk8的特性stream().map() 將對象轉換成另外一個對象

http://www.javashuo.com/article/p-dlhmsrle-he.htmlhtml   https://blog.csdn.net/sanchan/article/details/70753645java java8的optional的使用：web http://www.jdon.com/idea/java/using-optional-effectively-in-ja

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