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Lambda

Start from the beginning

by ShinkokuEndo

                                        
                                                      public static void main(String[] args){
        Anime[] animeArray = {
                new Anime("Danmachi", 6, "Action"),
                new Anime("Naruto", 3, "Action"),
                new Anime("Recreators", 5, "Comedy")
        };
        List<Anime> animeList = Arrays.stream(animeArray).toList();

        OtherUsedCaseOfLambda.displayWatchAnime2(animeList,
                (Anime anime) -> anime.watchedTimes >= 2 &&
                        anime.watchedTimes <= 10 &&
                        anime.animeGenre.equals("comedy"),
(Anime anime) -> anime.displayWatchAnime(anime));
    }
}
class Anime{
    String animeName;
    int watchedTimes;
    String animeGenre;

    public Anime(String name, int times, String genre){
        animeName = name;
        watchedTimes = times;
        animeGenre = genre.toLowerCase();
    }
public void displayWatchAnime(Anime anime){
        System.out.println(anime.animeGenre + " " + anime.animeName + ": " + anime.watchedTimes);
    }
}
==========================
Result:
comedy Recreators: 5
Another example, this time with a return type.
interface Function<T, R>{
    R apply(T t);
}
=========================
import java.util.Arrays;
import java.util.List;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.Predicate;
class OtherUsedCaseOfLambda {
    public static void displayWatchAnime2(
            List<Anime> list,
            Predicate<Anime> criteria,
   Function<Anime, String> mapping,
            Consumer<String> display){
        for(Anime anime: list) {
            if (criteria.test(anime)) {
  String result = mapping.apply(anime);
                display.accept(result);
            }
        }
    }
    public static void main(String[] args){
        Anime[] animeArray = {
                new Anime("Danmachi", 6, "Action"),
                new Anime("Naruto", 3, "Action"),
                new Anime("Recreators", 5, "Comedy")
        };
        List<Anime> animeList = Arrays.stream(animeArray).toList();

        OtherUsedCaseOfLambda.displayWatchAnime2(animeList,
                (Anime anime) -> anime.watchedTimes >= 2 &&
                        anime.watchedTimes <= 10 &&
                        anime.animeGenre.equals("comedy"),
(Anime anime) -> anime.getAnimeName(),
                (String str) -> System.out.println(str));
    }
}
class Anime{
    String animeName;
    int watchedTimes;
    String animeGenre;

    public Anime(String name, int times, String genre){
        animeName = name;
        watchedTimes = times;
        animeGenre = genre.toLowerCase();
    }
   public String getAnimeName(){
        return animeName;
    }
}
=========================
Result:
Recreators
In the Function interface, it has two data type which are two objects (Anime and String). Anime object was used as a parameter to its method apply() and the String was the return type of that method. 
8. Used generics more extensively
    You have seen what a generics is. like this standard function: 
interface Function<T, R>{
    R apply(T t);
}