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Java 8 Streams - Stream.isParallel Examples

[Last Updated: Nov 8, 2025]

Java 8 Streams Java Java API

Interface:

java.util.stream.BaseStream

Method:

boolean isParallel()

Returns whether this stream would execute in parallel during a terminal operation. This method should be called before calling a terminal operation.

Examples

package com.logicbig.example.stream;

import java.util.stream.Stream;

public class IsParallelExample {

    public static void main(String... args) {
        Stream<String> stream = Stream.of("one", "two", "three", "four");
        stream = stream.parallel();
        System.out.println(stream.isParallel());
    }
}

Output

true

package com.logicbig.example.stream;

import java.util.stream.Stream;

public class IsParallelExample2 {

    public static void main(String... args) {
        Stream<String> stream = Stream.of("one", "two", "three", "four");
        System.out.println(stream.isParallel());
    }
}

Output

false

See Also