OptionalLong getAsLong() method in Java with examples

OptionalLong help us to create an object which may or may not contain a long value. The getAsLong() method returns value If a value is present in OptionalLong object, otherwise throws NoSuchElementException.

Syntax:

public long getAsLong()

Parameters: This method accepts nothing.



Return value: This method returns the value described by this OptionalLong.

Exception: This method throws NoSuchElementException if no value is present

Below programs illustrate getAsLong() method:

Program 1:

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// Java program to demonstrate
// OptionalLong.getAsLong() method
  
import java.util.OptionalLong;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // Create an OptionalLong instance
        OptionalLong opLong = OptionalLong.of(445325);
  
        System.out.println("OptionalLong: "
                           + opLong.toString());
  
        // Get value in this instance
        // using getAsLong()
        System.out.println("Value in OptionalLong = "
                           + opLong.getAsLong());
    }
}

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Output:

OptionalLong: OptionalLong[445325]
Value in OptionalLong = 445325

Program 2:

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// Java program to demonstrate
// OptionalLong.getAsLong() method
  
import java.util.OptionalLong;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        try {
  
            // Create an OptionalLong instance
            OptionalLong opLong = OptionalLong.empty();
  
            System.out.println("OptionalLong: "
                               + opLong.toString());
  
            // Get value in this instance
            // using getAsLong()
            System.out.println("Value in OptionalLong = "
                               + opLong.getAsLong());
        }
        catch (Exception e) {
  
            System.out.println("Exception: " + e);
        }
    }
}

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Output:

OptionalLong: OptionalLong.empty
Exception: java.util.NoSuchElementException: No value present

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



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