MapflatMap.java

import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;


public class MapflatMap {
	
	public static void main(String args[])
	{
		List<Integer> PrimeNumbers = Arrays.asList(5, 7, 11,13); 
        
        // Creating a list of Odd Numbers 
        List<Integer> OddNumbers = Arrays.asList(1, 3, 5); 
          
        // Creating a list of Even Numbers 
        List<Integer> EvenNumbers = Arrays.asList(2, 4, 6, 8); 
        
        List<List<Integer>> listOfListofInts = 
                Arrays.asList(PrimeNumbers, OddNumbers, EvenNumbers);
        
        System.out.println("The Structure before flattening is : " + 
                listOfListofInts); 
        List<Integer> listofInts = listOfListofInts.stream().flatMap(list->list.stream()).collect(Collectors.toList());
        
        
        System.out.println("The Structure after flattening is : " + 
        		listofInts); 
	}

}