AllMetanitLessons/Collections/Map/Hash.java - master - GermanezZ/JavaExercises

AllMetanitLessons/Collections/Map/Hash.java
103 строки3 KB
germa
Уроки по Metanit
04 дек 2024, 20:39
04 дек 2024, 20:3948d575a
package AllMetanitLessons.Collections.Map;

import org.jetbrains.annotations.NotNull;

import java.util.*;

public class Hash {

    public static void main(String[] args) {

        HashMap<Integer, String> states = new HashMap<>();

        states.put(1,"Russia");
        states.put(2,"Germany");
        states.put(3,"Rome");


        String first = states.get(1);    // поскольку значение STRING мы делаем переменную стринг
        System.out.printf("First state is: %s\n",first);

        Set<Integer> set = states.keySet();
        System.out.println("Keys: " + set);
        Collection<String> strings = states.values();
        System.out.println("Values: " + strings);

        states.replace(2,"USA");
        states.remove(3);

        for (Map.Entry<Integer, String> item : states.entrySet()){
            System.out.printf("Key: %d, Value: %s \n", item.getKey(), item.getValue());
        }




        HashMap<Integer, Personn> people = new HashMap<>();

        people.put(1,new Personn("Tom"));
        people.put(2,new Personn("Bob"));
        people.put(3,new Personn("Tim"));
        people.put(4,new Personn("Bill"));
        people.put(5,new Personn("Milly"));


        people.replace(1,new Personn("Tommy"));

        for (Map.Entry<Integer, Personn> item : people.entrySet()){
            System.out.printf("ID: %d, Name: %s, Frase: %s\n", item.getKey(), item.getValue().getName(), item.getValue().Frase());
        }

        HashMap<Personn,String> characterPeople = new HashMap<>();

        characterPeople.put(new Personn("Bob"),"Аккуратный");
        characterPeople.put(new Personn("Tom"),"Опрятный");
        characterPeople.put(new Personn("Ruby"),"Усидчивый, вежливый");
        characterPeople.put(new Personn("Milly"),"Стрессоустойчивый");
        characterPeople.put(new Personn("Den"),"Экономный");

        for (Map.Entry<Personn, String> map : characterPeople.entrySet()){
            System.out.printf("Name: %s, Character: %s \n", map.getKey().getName(),map.getValue());
        }

        characterPeople.replace(new Personn("Ruby"),"Нет особых качеств");
        characterPeople.remove(new Personn("Ruby"));

        Set<Personn> peoples = characterPeople.keySet();
        for (Personn s : peoples){
            System.out.printf("Name: %s \n", s.getName());
        }

        Collection<String> stringss = characterPeople.values();
        System.out.print("Качества: ");
        for (String s : stringss){
            System.out.print(s + ", ");
        }



    }

}

class Personn implements Comparable<Personn>{

    private final String name;

    public Personn(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public String Frase(){
        return "I'm " + name + " and it's my legacy";
    }

    @Override
    public int compareTo(@NotNull Personn o) {
        return name.compareTo(o.getName());
    }
}