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 here import 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
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