The orElseGet(java.util.function.LongSupplier) method helps us to get the value in this OptionalLong object. If a value is not present in this OptionalLong, then this method returns the result produced by the supplying function, passed as the parameter
Syntax:
public long orElseGet(LongSupplier supplier)
Parameters: This method accepts the supplying function that produces a value to be returned.
Return value: This method returns the long 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.LongSupplier) method:
Program 1:
// Java program to demonstrate // OptionalLong.orElseGet(LongSupplier) method import java.util.OptionalLong;
public class GFG {
public static void main(String[] args)
{
// create a OptionalLong
OptionalLong oplong = OptionalLong.of( 2134 );
// get value using orElseGet
long value = oplong.orElseGet(() -> getlongValue());
// print value
System.out.println("value: " + value);
}
public static long getlongValue()
{
return 3242 + 123 ;
}
} |
value: 2134
Program 2:
// Java program to demonstrate // OptionalLong.orElseGet(LongSupplier) method import java.util.OptionalLong;
public class GFG {
public static void main(String[] args)
{
// create a OptionalLong
OptionalLong oplong = OptionalLong.empty();
// get value using orElseGet
long value = oplong.orElseGet(() -> getlongValue());
// print value
System.out.println("value: " + value);
}
public static long getlongValue()
{
return 3242 * 234 ;
}
} |
value: 758628