In this short example , i will explain where we can use flatMap function of java stream api .
Suppose you have a multi level list where many objects are stored , and you want to convert it to a single list of objects . We can use flatmap which will flatten the list easily .
FlatMap basically first applies the transformation , and then then flatten the result in a single collection .
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;
/**
* Created by abhishek.somani on 8/7/16.
*/
public class JavarootsFlatMapExample {
public static void main(String[] args) {
String[] arr = {"abhishekl","somani"};
String[] arr2 = {"java","example","1.8","stream"};
List<List<String>> list = new ArrayList<>();
list.add(Arrays.asList(arr));
list.add(Arrays.asList(arr2));
final List<String> strings = list.stream().flatMap(l -> l.stream()).collect(Collectors.toList());
System.out.println(strings);
}
}
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