Java8InAction/src/main/java/lambdasinaction/chap5/Finding.java at master · java8/Java8InAction · GitHub

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package lambdasinaction.chap5;

import lambdasinaction.chap4.*;

import java.util.stream.*;

import java.util.*;

import static lambdasinaction.chap4.Dish.menu;

public class Finding{

public static void main(String...args){

if(isVegetarianFriendlyMenu()){

System.out.println("Vegetarian friendly");

}

System.out.println(isHealthyMenu());

System.out.println(isHealthyMenu2());

Optional<Dish> dish = findVegetarianDish();

dish.ifPresent(d -> System.out.println(d.getName()));

}

private static boolean isVegetarianFriendlyMenu(){

return menu.stream().anyMatch(Dish::isVegetarian);

}

private static boolean isHealthyMenu(){

return menu.stream().allMatch(d -> d.getCalories() < 1000);

}

private static boolean isHealthyMenu2(){

return menu.stream().noneMatch(d -> d.getCalories() >= 1000);

}

private static Optional<Dish> findVegetarianDish(){

return menu.stream().filter(Dish::isVegetarian).findAny();

}

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