hello-java/basic/c05_structures/Maps.java at main · mouredev/hello-java · GitHub

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package basic.c05_structures;

Clase 43 - Maps

Vídeo: https://youtu.be/JOAqpdM36wI?t=14574

import java.util.HashMap;

public class Maps {

public static void main(String[] args) {

// Declaración y creación

HashMap<String, String> names = new HashMap<>();

var numbers = new HashMap<Integer, String>();

// Tamaño

System.out.println(names.size());

// Inserción

names.put("Brais", "brais@gmail.com");

names.put("Moure", "moure@gmail.com");

names.put("MoureDev", "mouredev@gmail.com");

System.out.println(names.size());

System.out.println(names);

// Acceso

System.out.println(names.get("Moure"));

System.out.println(names.get("Dev"));

// Verificación

System.out.println(names.containsKey("Moure"));

System.out.println(names.containsKey("Dev"));

System.out.println(names.containsValue("moure@gmail.com"));

// Eliminación

System.out.println(names.remove("Moure"));

System.out.println(names.remove("MoureDev"));

System.out.println(names);

// Limpieza

names.clear();

System.out.println(names);

// Modificación

names.put("Brais", "brais@gmail.com");

System.out.println(names);

names.put("Brais", "braismouredev@gmail.com");

System.out.println(names);

names.replace("Moure", "mouredev@gmail.com"); // Reemplaza el valor si existe

System.out.println(names);

names.putIfAbsent("Moure", "mouredev@gmail.com"); // Solo lo añade si no existe

System.out.println(names);

// Otras operaciones

System.out.println(names.isEmpty());

var values = names.values();

System.out.println(values);

}

hello-java/basic/c05_structures/Maps.java at main · mouredev/hello-java · GitHub

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