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ofNullable in Java 9 Stream

ofNullable() method of stream takes an object as an argument. If the provided object is non-null, returns a sequential Stream containing that single object, if the value passed to ofNullable() method is null then  it returns an empty Stream.

Java 9 Stream ofNullable Method Example

package com.java4coding.test;

 

import java.util.stream.Collectors;

import java.util.stream.Stream;

 

public class Test {

        public static void main(String[] args) {

                Integer i1 = 1;

                Stream<Integer> stream1 = Stream.ofNullable(i1);

                System.out.println(stream1.collect(Collectors.toList()));

               

                Integer i2 = null;

                Stream<Integer> stream2 = Stream.ofNullable(i2);

                System.out.println(stream2.collect(Collectors.toList()));

               

        }

}

Output:

[1]

[]

 

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