Java 8 Optional is not just a replacement for null(vanillajava.blogspot.com)
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Java 8 Optional is not just a replacement for null
http://vanillajava.blogspot.com/2015/01/java-8-optional-is-not-just-for.html
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http://vanillajava.blogspot.com/2015/01/java-8-optional-is-not-just-for.html
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