OptionalDouble ifPresentOrElse() method in Java with examples
The ifPresentOrElse(java.util.function.DoubleConsumer, java.lang.Runnable) method helps us to perform the specified DoubleConsumer action the value of this OptionalDouble object. If a value is not present in this OptionalDouble, then this method performs the given empty-based Runnable emptyAction, passed as the second parameter
public void ifPresentOrElse(DoubleConsumer action, Runnable emptyAction)
Parameters: This method accepts two parameters:
- action: which is the action to be performed on this Optional, if a value is present.
- emptyAction: which is the empty-based action to be performed, if no value is present.
Return value: This method returns nothing.
Exception: This method throw NullPodoubleerException if a value is present and the given action is null, or no value is present and the given empty-based action is null.
Below programs illustrate ifPresentOrElse() method:
Value is present, its: 12
Value is empty
References: https://docs.oracle.com/javase/10/docs/api/java/util/OptionalDouble.html#ifPresentOrElse(java.util.function.DoubleConsumer, java.lang.Runnable)
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