Example to avoid NullPointerException using Optional

ExampleWithOptional.java

package com.viveknaskar;

import java.util.Optional;

public class ExampleWithOptional {
    public static void main(String[] args) {
        String[] cities = new String[10];
        /**
         * Using Optional class, we are doing a null check at cities[5]
         */
        Optional<String> nullCheck = Optional.ofNullable(cities[5]);
        if (nullCheck.isPresent()) {
            String city = cities[5].toLowerCase();
            System.out.print(city);
        } else {
            System.out.println("The array is null");
        }

    }
}