Optional Class | isPresent() function
Last Updated :
22 Feb, 2018
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
import java.util.Optional;
public class present {
public static void main(String args[]) {
Optional<Integer> value1 = Optional.ofNullable( 10 );
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
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