Java Optional Map Example
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Java Optional Map Example
3 you are totally correct. You can see more about the filter () method and ifpresent () method of the optional object to understand more about the example. If you refer to the javadoc for orelsethrow (), you will see that it returns the present value [of the optional].
3 you are totally correct. The main advantage of this new construct is that no more too many null checks and nullpointerexception.it avoids any runtime nullpointerexceptions and supports us in developing clean and neat java apis or applications. Java 8 has introduced a new class optional in java.util package.
This method is similar to #map(function), but the provided mapper is one whose result is already an optional, and if invoked, flatmap does not wrap it with an additional optional.
A map doesn't allow duplicate keys, but you can have duplicate values. Returns an optional describing the value of this optional, if a value is present, otherwise, an. Public class optionalexample { public static void main (string [] args) { string [] str = new string [10]; This method is similar to #map(function), but the provided mapper is one whose result is already an optional, and if invoked, flatmap does not wrap it with an additional optional.
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