[Java8]如何正确使用Optional | KAAAsS's blog



[Java8]如何正确使用Optional | KAAAsS's blog

这样改写非但不简洁，而且其操作还是和第一段代码一样。无非就是用isPresent方法来替代u==null。这样的改写并不是Optional正确的用法，我们再来改写一次。


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