Example usage for java.util.stream LongStream reduce

Introduction

In this page you can find the example usage for java.util.stream LongStream reduce.

Prototype

OptionalLong reduce(LongBinaryOperator op);

Source Link

Document

Performs a reduction on the elements of this stream, using an associative accumulation function, and returns an OptionalLong describing the reduced value, if any.

Usage

From source file:Main.java

public static void main(String[] args) {
    LongStream b = LongStream.of(1L, 2L, 3L, 4L);

    OptionalLong v = b.reduce(Long::sum);
    if (v.isPresent()) {
        System.out.println(v.getAsLong());
    } else {/*from www .  j  av a2 s. c  o m*/
        System.out.println("no value");
    }

}

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