How to Use Java IntStream

IntStream supports creating sequences of primitive integer elements and parallel aggregate processing.
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How to Use IntStream

IntStream supports creating sequences of primitive integer elements and parallel aggregate processing.

package com.devkuma.basic.stream;

import java.util.stream.IntStream;

public class IntStreamRange {

    public static void main(String[] args) {
        System.out.println("range:");
        IntStream.range(0, 10).forEach(System.out::println);

        System.out.println("rangeClosed:");
        IntStream.rangeClosed(0, 10).forEach(System.out::println);

        System.out.println("sum:");
        System.out.println(IntStream.range(0, 10).sum());

        System.out.println("max:");
        System.out.println(IntStream.range(0, 10).max());

        System.out.println("min:");
        System.out.println(IntStream.range(0, 10).min());

        System.out.println("average:");
        System.out.println(IntStream.range(0, 10).average());
    }
}

range()

The following example displays values from 0 to 9. range() does not include the end value.

IntStream.range(0, 10).forEach(System.out::println);

Result:

0
1
2
3
4
5
6
7
8
9

rangeClosed()

The following example displays values from 0 to 10. rangeClosed() includes the end value.

IntStream.rangeClosed(0, 10).forEach(System.out::println);

Result:

0
1
2
3
4
5
6
7
8
9
10

sum()

sum() can calculate the sum from 0 to 10 as follows.

System.out.println(IntStream.range(0, 10).sum());

Result:

45

max()

max() can easily find the maximum value.

System.out.println(IntStream.range(0, 10).max());

Result:

OptionalInt[9]

min()

min() can easily find the minimum value.

System.out.println(IntStream.range(0, 10).min());

Result:

OptionalInt[0]

average()

average() can calculate the average.

System.out.println(IntStream.range(0, 10).average());

Result:

OptionalDouble[4.5]
  • LongStream
  • DoubleStream