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Optional Class | isPresent() function

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  • Difficulty Level : Easy
  • Last Updated : 22 Feb, 2018
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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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