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Java HashMap

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naly moslih answered on January 6, 2021 Popularity 10/10 Helpfulness 2/10

answer Java HashMap

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Java HashMap

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import java.util.HashMap; // import the HashMap class

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

Popularity 10/10 Helpfulness 2/10 Language java

Source: Grepper

Tags: hashmap java

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Contributed on May 23 2022

naly moslih

0 Answers Avg Quality 2/10

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hashmap in java

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import java.util.HashMap;
import java.util.Map;
import java.util.Set;

public class HashhMap {
    public static void main(String[] args){
        Map<String, String> map = new HashMap<>();
        map.put("myName","Kumaran");
        map.put("myProgram", "Java");
        map.put("Designation", "Java Developer");

        Set<String> key = map.keySet();


        for(String keys: key){
            System.out.println(keys+ " : "  +map.get(keys));
        }
    }
}

Popularity 10/10 Helpfulness 3/10 Language java

Source: Grepper

Tags: hashmap

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Contributed on May 06 2022

Kumaran KM

0 Answers Avg Quality 2/10

HashMap java

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package org.o7planning.tutorial.javacollection.helloworld;

import java.util.HashMap;

public class HelloHashMap {

	public static void main(String[] args) {

		// Créer un objet HashMap qui stocke les paires des ID d'employés et des salaires.
		// Clé de chaîne: ID d'employé
		// Valeur flottante: Salaire.
		HashMap<String, Float> salaryMap = new HashMap<String, Float>();
	 

		salaryMap.put("E01", 1000f);
		salaryMap.put("E02", 12000f);
		salaryMap.put("E03", 12300f);
		salaryMap.put("E04", 1000f);
		salaryMap.put("E05", 300.5f);
		
		// Obtenir les salaires des employés 'E02'
		Float salary= salaryMap.get("E01");
		System.out.println("Salary of employee E01 = "+ salary);
		
		// Mettre à jour le salaire pour les employés 'E05'
		salaryMap.put("E05", 400f);
		
		System.out.println("Salary of employee E05 = "+ salaryMap.get("E05"));
		 
	}

}

Popularity 10/10 Helpfulness 2/10 Language java

Source: devstory.net

Tags: hashmap

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Contributed on Jan 23 2022

Tame Tortoise

0 Answers Avg Quality 2/10

java hashmap

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// Java program to illustrate HashMap class of java.util
// package
  
// Importing HashMap class
import java.util.HashMap;
  
// Main class
public class GFG {
  
    // Main driver method
    public static void main(String[] args)
    {
        // Create an empty hash map by declaring object
        // of string and integer type
        HashMap<String, Integer> map = new HashMap<>();
  
        // Adding elements to the Map
        // using standard put() method
        map.put("vishal", 10);
        map.put("sachin", 30);
        map.put("vaibhav", 20);
  
        // Print size and content of the Map
        System.out.println("Size of map is:- "
                           + map.size());
  
        // Printing elements in object of Map
        System.out.println(map);
  
        // Checking if a key is present and if
        // present, print value by passing
        // random element
        if (map.containsKey("vishal")) {
  
            // Mapping
            Integer a = map.get("vishal");
  
            // Printing value for the corresponding key
            System.out.println("value for key"
                               + " \"vishal\" is:- " + a);
        }
    }
}

Popularity 10/10 Helpfulness 2/10 Language java

Source: www.geeksforgeeks.org

Tags: hashmap

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Contributed on Aug 08 2023

Crowded Copperhead

0 Answers Avg Quality 2/10

hashmap

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// Java program to illustrate HashMap class 
// of java.util package
 
// Importing HashMap class
import java.util.HashMap;
 
// Main class
public class GFG {
 
    // Main driver method
    public static void main(String[] args)
    {
        // Create an empty hash map by declaring object
        // of string and integer type
        HashMap<String, Integer> map = new HashMap<>();
 
        // Adding elements to the Map
        // using standard put() method
        map.put("vishal", 10);
        map.put("sachin", 30);
        map.put("vaibhav", 20);
 
        // Print size and content of the Map
        System.out.println("Size of map is:- "
                           + map.size());
 
        // Printing elements in object of Map
        System.out.println(map);
 
        // Checking if a key is present and if
        // present, print value by passing
        // random element
        if (map.containsKey("vishal")) {
 
            // Mapping
            Integer a = map.get("vishal");
 
            // Printing value for the corresponding key
            System.out.println("value for key"
                               + " \"vishal\" is:- " + a);
        }
    }
}

Popularity 9/10 Helpfulness 2/10 Language java

Source: www.geeksforgeeks.org

Tags: hashmap

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Contributed on Feb 20 2024

Jeya Surya

0 Answers Avg Quality 2/10

hashmap java

Comment

    private static final Map<Integer, String> map = Map.of(
        1, "one",
        2, "two"
    );

Popularity 10/10 Helpfulness 1/10 Language java

Source: www.techiedelight.com

Tags: hashmap

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Contributed on Oct 31 2021

Vivacious Vulture

0 Answers Avg Quality 2/10

Hashmap

Comment

-1

// hashMap creation with 8 capacity and 0.6 load factor
HashMap<K, V> numbers = new HashMap<>();

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

Popularity 10/10 Helpfulness 1/10 Language whatever

Source: www.programiz.com

Tags: hashmap

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Contributed on Nov 02 2022

Better Badger

0 Answers Avg Quality 2/10

Hashmap

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#include <iostream>
#include <string>
#include <unordered_map>
 
int main()
{
    // Create an unordered_map of three strings (that map to strings)
    std::unordered_map<std::string, std::string> u = {
        {"RED","#FF0000"},
        {"GREEN","#00FF00"},
        {"BLUE","#0000FF"}
    };
 
    // Helper lambda function to print key-value pairs
    auto print_key_value = [](const auto& key, const auto& value) {
        std::cout << "Key:[" << key << "] Value:[" << value << "]\n";
    };
 
    std::cout << "Iterate and print key-value pairs of unordered_map, being\n"
                 "explicit with their types:\n";
    for( const std::pair<const std::string, std::string>& n : u ) {
        print_key_value(n.first, n.second);
    }
 
    std::cout << "\nIterate and print key-value pairs using C++17 structured binding:\n";
    for( const auto& [key, value] : u ) {
        print_key_value(key, value);
    }
 
    // Add two new entries to the unordered_map
    u["BLACK"] = "#000000";
    u["WHITE"] = "#FFFFFF";
 
    std::cout << "\nOutput values by key:\n"
                 "The HEX of color RED is:[" << u["RED"] << "]\n"
                 "The HEX of color BLACK is:[" << u["BLACK"] << "]\n\n";
 
    std::cout << "Use operator[] with non-existent key to insert a new key-value pair:\n";
    print_key_value("new_key", u["new_key"]);
 
    std::cout << "\nIterate and print key-value pairs, using `auto`;\n"
                 "new_key is now one of the keys in the map:\n";
    for( const auto& n : u ) {
        print_key_value(n.first, n.second);
    }
}

Popularity 10/10 Helpfulness 1/10 Language cpp

Source: en.cppreference.com

Tags: c++

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Contributed on Nov 04 2022

Ifza Gul

0 Answers Avg Quality 2/10

hashmap

Comment

- HasHMap can have null key, order is not guaranteed

Popularity 10/10 Helpfulness 1/10 Language whatever

Source: Grepper

Tags: hashmap

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Contributed on Jan 06 2021

Obedient Ocelot

0 Answers Avg Quality 2/10

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