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How to use IntStream in lambdas and method references in Java?
An IntStream interface extends the BaseStream interface in Java 8. It is a sequence of primitive int-value elements and a specialized stream for manipulating int values. We can also use the IntStream interface to iterate the elements of a collection in lambda expressions and method references.
Syntax
public interface IntStream extends BaseStream<Integer, IntStream>
Example
import java.util.stream.IntStream;
public class StringToIntegerStreamTest {
public static void main(String[] args) {
String str = "Tutorials Point";
IntStream stream = str.chars();
stream.forEach(element -> System.out.println(((char)element))); // using
lambda expression
}
}Output
T u t o r i a l s P o i n t
Example
import java.util.*;
import java.util.stream.IntStream;
public class IntStreamTest {
public static void main(String[] args) {
final List<Integer> list = Arrays.asList(1, 2, 3);
list.stream().forEach(System.out::println); // Using method reference
final IntStream intStream = IntStream.iterate(1, i -> i + 1);
final int sum = intStream.limit(100).sum();
System.out.println("sum: " + sum);
}
}Output
1 2 3 sum: 5050
Updated on: 13-Jul-2020
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