The isPresent() function in Optional Class is used to evaluate whether the value if assigned to variable is present or not.
Syntax
value.isPresent() Returns: It returns true if value is assigned otherwise false
Examples:
Input : Optional value1 = Optional.ofNullable(10);
value1.isPresent()
Output : True
Input : Optional value2 = Optional.ofNullable(null);
value2.isPresent()
Output : False
// Write Java code hereimport java.util.Optional;public class present {public static void main(String args[]) { // Optional.ofNullable - allows passed // parameter to be not null. Optional<Integer> value1 = Optional.ofNullable(10); // Optional.ofNullable - allows passed // parameter to be null. Optional<Integer> value2 = Optional.ofNullable(null); System.out.println("First parameter is present:" + value1.isPresent()); System.out.println("Second parameter is present:" + value2.isPresent());}} |
Output : true Output : false
