LongStream mapToInt() returns an IntStream consisting of the results of applying the given function to the elements of this stream.
Note : LongStream mapToInt() 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 :
LongStream mapToInt(LongToIntFunction mapper)
Parameters :
- LongStream : A sequence of primitive long-valued elements. This is the long primitive specialization of Stream.
- mapper : A stateless function to apply to each element.
Return Value : The function returns an IntStream consisting of the results of applying the given function to the elements of this stream.
Example 1 :
// Java code for LongStream mapToInt// (LongToIntFunction mapper)import java.util.*;import java.util.stream.IntStream;import java.util.stream.LongStream;  class GFG {      // Driver code    public static void main(String[] args)    {        // Creating a LongStream        LongStream stream = LongStream.of(2L, 4L, 6L, 8L, 10L);                  // Using LongStream mapToInt(LongToIntFunction mapper)        // to return an IntStream consisting of the        // results of applying the given function to         // the elements of this stream.        IntStream stream1 = stream.mapToInt(num -> (int) num);           // Displaying the elements in stream1        stream1.forEach(System.out::println);    }} |
Output :
2 4 6 8 10
Example 2 :
// Java code for LongStream mapToInt// (LongToIntFunction mapper)import java.util.*;import java.util.stream.IntStream;import java.util.stream.LongStream;  class GFG {      // Driver code    public static void main(String[] args)    {        // Creating a LongStream        LongStream stream = LongStream.of(1L, 2L, 3L, 4L, 5L);                  // Using LongStream mapToInt(LongToIntFunction mapper)        // to return an IntStream consisting of the        // results of applying the given function to         // the elements of this stream.        IntStream stream1 = stream.mapToInt(num ->                                   (int) num + Integer.MAX_VALUE);           // Displaying the elements in stream1        stream1.forEach(System.out::println);    }} |
Output :
-2147483648 -2147483647 -2147483646 -2147483645 -2147483644
Example 3 :
// Java code for LongStream mapToInt// (LongToIntFunction mapper)import java.util.*;import java.util.stream.IntStream;import java.util.stream.LongStream;  class GFG {      // Driver code    public static void main(String[] args)    {        // Creating a LongStream        LongStream stream = LongStream.range(2L, 7L);                  // Using LongStream mapToInt(LongToIntFunction mapper)        // to return an IntStream consisting of the        // results of applying the given function to         // the elements of this stream.        IntStream stream1 = stream.mapToInt(num ->                                    (int) num - 2);           // Displaying the elements in stream1        stream1.forEach(System.out::println);    }} |
Output :
0 1 2 3 4
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