LongStream mapToObj() returns an object-valued Stream consisting of the results of applying the given function.
Note : LongStream mapToObj() is a intermediate operation. These operations are always lazy. Intermediate operations are invoked on a Stream instance and after they finish their processing, they give a Stream instance as output.
Syntax :
<U> Stream<U> mapToObj(LongFunction<? extends U> mapper)
Parameters :
- U : The element type of the new stream.
- Stream : A sequence of elements supporting sequential and parallel aggregate operations.
- LongFunction : Represents a function that accepts a long-valued argument and produces a result.
- mapper : A stateless function to apply to each element.
Return Value : The function returns an object-valued Stream consisting of the results of applying the given function.
Example 1 :
// Java code for LongStream mapToObj// (LongFunction mapper)import java.util.*;import java.util.stream.Stream;import java.util.stream.LongStream;  class GFG {      // Driver code    public static void main(String[] args)    {        // Creating an LongStream        LongStream stream = LongStream.range(3L, 8L);          // Creating a Stream of Strings        // Using LongStream mapToObj(LongFunction mapper)        // to store binary representation of        // elements in LongStream        Stream<String> stream1 = stream.mapToObj(num                                                 -> Long.toBinaryString(num));          // Displaying an object-valued Stream        // consisting of the results of        // applying the given function.        stream1.forEach(System.out::println);    }} |
Output :
11 100 101 110 111
Example 2 :
// Java code for LongStream mapToObj// (LongFunction mapper)import java.util.*;  import java.math.BigInteger;import java.util.stream.Stream;import java.util.stream.LongStream;  class GFG {      // Driver code    public static void main(String[] args)    {        // Creating an LongStream        LongStream stream = LongStream.of(3L, 5L, 7L, 9L, 11L);          // Creating a Stream        // Using LongStream mapToObj(LongFunction mapper)        Stream<BigInteger> stream1 = stream                                         .mapToObj(BigInteger::valueOf);          // Displaying an object-valued Stream        // consisting of the results of        // applying the given function.        stream1.forEach(num -> System.out.println(num.add(BigInteger.TEN)));    }} |
Output :
13 15 17 19 21
