Optional orElseGet() Method Example

In this source code example, we will demonstrate how to get the default value using the Optional orElseGet() method.

The orElseGet() method returns the value if present, otherwise invoke other and return the result of that invocation.

Optional orElseGet() Method Example

In the below example, orElseGet() method return default value because Optional contains null value:


import java.util.Optional;

public class OptionalDemo {
    public static void main(String[] args) {

        String email = null;
        Optional<String> stringOptional = Optional.ofNullable(email);
        String defaultOptional2 = stringOptional.orElseGet(() -> "default@gmail.com");
        System.out.println(defaultOptional2);
    }
}
Output:
default@gmail.com
In the below example, orElse() method return actual value because Optional contains actual value:
import java.util.Optional;

public class OptionalDemo {
    public static void main(String[] args) {

        String email = "ramesh@gmail.com";
        Optional<String> stringOptional = Optional.ofNullable(email);
        String defaultOptional2 = stringOptional.orElseGet(() -> "default@gmail.com");
        System.out.println(defaultOptional2);
    }
}
Output:
ramesh@gmail.com

Related Optional Class Method Examples

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