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OptionalInt stream() method in Java with examples

  • Last Updated : 28 May, 2019

The stream() method help us to get value contain by OptionalInt as IntStream. If a value is present, method returns a sequential IntStream containing only that value, otherwise returns an empty IntStream.

Syntax:

public IntStream stream()

Parameters: This method accepts nothing.

Return value: This method returns the optional value as an IntStream.

Below programs illustrate stream() method:
Program 1:






// Java program to demonstrate
// OptionalInt.stream() method
  
import java.util.OptionalInt;
import java.util.stream.IntStream;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // create a OptionalInt
        OptionalInt opInt = OptionalInt.of(452146);
  
        // get value as stream
        IntStream out = opInt.stream();
  
        // print value
        System.out.println("Value:");
        out.forEach(System.out::println);
    }
}

Output:

Program 2:




// Java program to demonstrate
// OptionalInt.stream() method
  
import java.util.OptionalInt;
import java.util.stream.IntStream;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // create a OptionalInt
        OptionalInt opInt = OptionalInt.empty();
  
        // get value as stream
        IntStream out = opInt.stream();
  
        // print value
        if (out.count() == 0)
            System.out.println("opInt is empty");
    }
}

Output:

References: https://docs.oracle.com/javase/10/docs/api/java/util/OptionalInt.html#empty()

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