OptionalDouble orElseGet() method in Java with examples
Last Updated :
14 Apr, 2023
The orElseGet(java.util.function.DoubleSupplier) method helps us to get the value in this OptionalDouble object. If a value is not present in this OptionalDouble, then this method returns the result produced by the supplying function, passed as the parameter
Syntax:
public double orElseGet(DoubleSupplier supplier)
Parameters: This method accepts the supplying function that produces a value to be returned.
Return value: This method returns the double value, if present, otherwise the result produced by the supplying function.
Exception: This method throw NullPointerException if no value is present and the supplying function is null.
Below programs illustrate orElseGet(java.util.function.DoubleSupplier) method:
Program 1:
Java
import java.util.OptionalDouble;
public class GFG {
public static void main(String[] args)
{
OptionalDouble opdouble = OptionalDouble.of( 2134 );
double value = opdouble.orElseGet(() -> getdoubleValue());
System.out.println("value: " + value);
}
public static double getdoubleValue()
{
return 3242 + 123 ;
}
}
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Program 2:
Java
import java.util.OptionalDouble;
public class GFG {
public static void main(String[] args)
{
OptionalDouble opdouble = OptionalDouble.empty();
double value = opdouble.orElseGet(() -> getdoubleValue());
System.out.println("value: " + value);
}
public static double getdoubleValue()
{
return 3242 * 234 ;
}
}
|
References: https://docs.oracle.com/javase/10/docs/api/java/util/OptionalDouble.html#orElseGet(java.util.function.DoubleSupplier)
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