Question

How to use Optional Int (OptionalInt) (object which may contain a int value or empty value) in Java

Answer 1

import java.util.*; 

public class MyClass {
    public static void main(String args[]) {
        OptionalInt oi = OptionalInt.of(13); 
  
        System.out.println(oi); 
  
        System.out.println(oi.getAsInt() + 1); 
    }
}



/*
run:

OptionalInt[13]
14

*/

 

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Answer 2

import java.util.*; 

public class MyClass {
    public static void main(String args[]) {
        try {
            OptionalInt oi = OptionalInt.empty(); 
  
            System.out.println(oi); 
  
            System.out.println(oi.getAsInt()); 
        } 
        catch (Exception e) { 
            System.out.println(e); 
        } 
    }
}



/*
run:

OptionalInt.empty
java.util.NoSuchElementException: No value present

*/

 

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