LongStream flatMapToLong(Function <? super T, ? extends LongStream> mapper)

// Java code for Stream flatMapToLong
// (Function mapper) to get an LongStream
// consisting of the results of replacing
// each element of this stream with the
// contents of a mapped stream.
import java.util.*;
import java.util.stream.LongStream;
  
class GFG {
  
    // Driver code
    public static void main(String[] args)
    {
  
        // Creating a list of Strings
        List<String> list = Arrays.asList("1", "2", "3",
                                          "4", "5");
  
        // Using Stream flatMapToLong(Function mapper)
        list.stream().flatMapToLong(num -> 
                     LongStream.of(Long.parseLong(num))).
                            forEach(System.out::println);
    }
}

1
2
3
4
5

// Java code for Stream flatMapToLong
// (Function mapper) to get an LongStream
// consisting of the results of replacing
// each element of this stream with the
// contents of a mapped stream.
import java.util.*;
import java.util.stream.LongStream;
  
class GFG {
  
    // Driver code
    public static void main(String[] args)
    {
  
        // Creating a List of Strings
        List<String> list = Arrays.asList("Geeks", "GFG",
                                 "GeeksforGeeks", "gfg");
  
        // Using Stream flatMapToLong(Function mapper)
        // to get length of all strings present in list
        list.stream().flatMapToLong(str -> 
                        LongStream.of(str.length())).
                        forEach(System.out::println);
    }
}

5
3
13
3

// Java code for Stream mapToLong
// (ToLongFunction mapper) to get a
// LongStream by applying the given function
// to the elements of this stream.
import java.util.*;
import java.util.stream.LongStream;
  
class GFG {
  
    // Driver code
    public static void main(String[] args)
    {
        // Creating a list of Strings
        List<String> list = Arrays.asList("5.36","27.9",
                                         "3","4.2","5");
  
        // Using Stream mapToLong(ToLongFunction mapper)
        // and displaying the corresponding LongStream
        list.stream().flatMapToLong(n
                     -> LongStream.of(Long.parseLong(n)) )
                     .forEach(System.out::println);
    }
}

Exception in thread "main" java.lang.NumberFormatException: For input string: "5.36"