How return null by using Stream API?
Clash Royale CLAN TAG#URR8PPPHow return null by using Stream API?
So, I have an ArrayList of autogenerated strings. I want to find first element that contains some character or else, if there is no one element that mach this filter, to apply other filter. In other way I want to return null object.
ArrayList
null
So I write this lambda expression:
str.stream()
.filter(s -> s.contains("q"))
.findFirst()
.orElseGet(() -> str.stream()
.filter(s -> s.contains("w"))
.findFirst()
.orElseGet(null))
But if there is no one element that mach this two filters I will have NullPointerException. Haw can I get somethink like: return null?
return null
Optional
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Don't. Instead, return an
Optionaland let the client decide what to do with it.– Luiggi Mendoza
17 secs ago