package java_8.optional;

import java.util.Optional;

import java.util.Random;

import java.util.function.Supplier;

public class Tester {

public static void main(String[] args) {

String[] str = new String[10];

str[0] = "Hello";

Optional<String> valueAt0 = Optional.of(str[0]);

if (valueAt0.isPresent()) {

System.out.println(valueAt0.get());

}

valueAt0.ifPresent(System.out::println);

Optional<String> valueAt5 = Optional.ofNullable(str[5]);

if (valueAt5.isEmpty()) {

System.out.println("Value not present");

}

System.out.println(valueAt5.orElse("Value not found"));

System.out.println(valueAt5.orElseGet(Tester::getRandomName));

}

private static String getRandomName() {

Random random = new Random();

int value = random.nextInt(5);

return "Value " + value;

}

}