Java 8 Optional Flatmap
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Java 8 Optional Flatmap
[c, d] [e, f] in the above case, the stream#filter will filter out the entire [a, b], but we want to filter out only the character a. By using the flattening mechanism, it merges all streams into a single resultant stream. Now, optional2 has an optional value of optional1.
Java 8 flatmap () example. Now you can chain these optional 's using the flatmap () operator. Create a custom collector (my favorate in java 8 if you need to do this a lot) // presentcollector.java:
If the specified value is null, then this method returns optional.empty.
If a value is present, ispresent () will return true and get () will return the value. In java, to convert a 2d array into a 1d array, we can loop the 2d array and put all the elements into a new array; Of course, using map makes more sense in this example (as in your. Java 8 introduced optional as one of it’s main feature.
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