Learn Java 8 streams with an example - print odd/even numbers from Array and List

March 15, 2021

Example 1: Java 8 program to print odd numbers from a List

import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

/*Java 8 Program to find Odd Numbers from a List*/
public class DriverClass {
    public static void main(String[] args) {
        List<Integer> numbers = Arrays.
                              asList(1, 4, 8, 40, 11, 22, 33, 99);
        List<Integer> oddNumbers = numbers.stream().
                                    filter(o -> o % 2 != 0).
                                     collect(Collectors.toList());
        System.out.println(oddNumbers);
    }
}

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Example 2: Java 8 program to print even numbers from a List

import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

/Java 8 Program to find Even Numbers from a List/
public class DriverClass {
public static void main(String[] args) {
List<Integer> numbers = Arrays.
asList(1, 4, 8, 40, 11, 22, 33, 99);
List<Integer> evenNumbers = numbers.stream().
filter(o -> o % 2 == 0).
collect(Collectors.toList());
System.out.println(evenNumbers);
}
}

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Example 3: Java 8 program to print even numbers from an array

import java.util.Arrays;

/*Java 8 Program to find Even Numbers from an Array*/
public class DriverClass {
    public static void main(String[] args) {
        int[] numbers = {2, 5, 7, 8, 99, 1, 22, 4, 3, 77, 66};
        Arrays.stream(numbers).filter(o -> o % 2 == 0).
                              forEach(System.out::println);
    }
}

Example 4: Java 8 program to print odd numbers from an array

import java.util.Arrays;

/*Java 8 Program to find Odd Numbers from an Array*/
public class DriverClass {
    public static void main(String[] args) {
        int[] numbers = {2, 5, 7, 8, 99, 1, 22, 4, 3, 77, 66};
        Arrays.stream(numbers).filter(o -> o % 2 != 0).
                                    forEach(System.out::println);
    }
}

Example 5: Java 8 program to print odd numbers from a Set

import java.util.Set;
import java.util.stream.Collectors;

/*Java 8 Program to find Odd Numbers from a set*/
public class DriverClass {
    public static void main(String[] args) {
        Set<Integer> numbers = Set.of(1, 4, 8, 40, 11, 22, 33, 99);
        Set<Integer> oddNumbers = numbers.stream().
                                   filter(o -> o % 2 != 0).
                                    collect(Collectors.toSet());
        System.out.println(oddNumbers);
    }
}

Example 6: Java 8 program to print even numbers from a Set

import java.util.Set;
import java.util.stream.Collectors;

/*Java 8 Program to find even numbers from a set*/
public class DriverClass {
    public static void main(String[] args) {
        Set<Integer> numbers =Set.of(1, 4, 8, 40, 11, 22, 33, 99);
        Set<Integer> evenNumbers = numbers.stream().
                                    filter(o -> o % 2 == 0).
                                     collect(Collectors.toSet());
        System.out.println(evenNumbers);
    }
}