LongStream peek() es un método en java.util.stream.LongStream. La función devuelve una secuencia que consta de los elementos de esta secuencia y, además, realiza la acción proporcionada en cada elemento a medida que se consumen elementos de la secuencia resultante.
Sintaxis:
LongStream peek(LongConsumer action) Where, LongStream is a sequence of primitive long-valued elements and the function returns a parallel LongStream and LongConsumer represents an operation that accepts a single long-valued argument.
Ejemplo 1: Realización de una suma en un flujo de rango dado.
// Java code for LongStream peek()
// where the action performed is to get
// sum of all elements in given range
import java.util.*;
import java.util.stream.LongStream;
class GFG {
// Driver code
public static void main(String[] args)
{
// Creating a stream of longs
LongStream stream = LongStream.range(2L, 10L);
// performing action sum on elements of
// given range and storing the result in sum
long sum = stream.peek(System.out::println).sum();
// Displaying the result of action performed
System.out.println("sum is : " + sum);
}
}
Producción:
2 3 4 5 6 7 8 9 sum is : 44
Ejemplo 2: Realización de una operación de conteo en un flujo de rango dado.
// Java code for LongStream peek()
// where the action performed is to get
// count of all elements in given range
import java.util.*;
import java.util.stream.LongStream;
class GFG {
// Driver code
public static void main(String[] args)
{
// Creating a stream of longs
LongStream stream = LongStream.range(2L, 10L);
// performing action count on elements of
// given range and storing the result in Count
long Count = stream.peek(System.out::println).count();
// Displaying the result of action performed
System.out.println("count : " + Count);
}
}
Producción:
2 3 4 5 6 7 8 9 count : 8
Ejemplo 3: Realización de una operación promedio en un flujo de rango dado.
// Java code for LongStream peek()
// where the action performed is to get
// average of all elements in given range
import java.util.*;
import java.util.OptionalDouble;
import java.util.stream.LongStream;
class GFG {
// Driver code
public static void main(String[] args)
{
// Creating a stream of longs
LongStream stream = LongStream.range(2L, 10L);
// performing action average on elements of
// given range and storing the result in avg
OptionalDouble avg = stream.peek(System.out::println)
.average();
// If a value is present, isPresent()
// will return true, else -1 is displayed.
if (avg.isPresent()) {
System.out.println("Average is : " + avg.getAsDouble());
}
else {
System.out.println("-1");
}
}
}
Producción:
2 3 4 5 6 7 8 9 Average is : 5.5
Publicación traducida automáticamente
Artículo escrito por Sahil_Bansall y traducido por Barcelona Geeks. The original can be accessed here. Licence: CCBY-SA