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map in java

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Obedient Ocelot answered on January 6, 2021 Popularity 10/10 Helpfulness 3/10

answer map in java

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map in java

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MAP : is a (key-value format) 
      and keys are always unique, 
      and value can be duplicated. 
- HashTable don't have null key, sychronized(thread-safe)
- LinkedHashMap can have null key, keeps order
- HasHMap can have null key, order is not guaranteed
- TreeMap doesn't have null key and keys are sorted

Popularity 10/10 Helpfulness 3/10 Language java

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Tags: java map

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Contributed on Jan 06 2021

Obedient Ocelot

0 Answers Avg Quality 2/10

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map java

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

public class MapForEachExample {
    public static void main(String[] args) {
        // Creating a Map
        Map<String, Integer> populationMap = new HashMap<>();
        populationMap.put("New York", 8419600);
        populationMap.put("Los Angeles", 3990456);
        populationMap.put("Chicago", 2716000);
        populationMap.put("Houston", 2328074);
        populationMap.put("Phoenix", 1680992);

        // Using forEach with Map.Entry
        populationMap.forEach((key, value) -> System.out.println("Key: " + key + ", Value: " + value));
        // Alternative : for-each with Entry and entrySet()
        for (Map.Entry<String, Integer> entry : populationMap.entrySet()) {
            System.out.println("Key: " + entry.getKey() + ", Value: " + entry.getValue());
        }

        //Using forEach with method reference
        System.out.println("\nUsing forEach with method reference:");
        populationMap.forEach(MapForEachExample::printEntry);
        // Alternative : normal for-each loop
        Set<String> mapKeys = populationMap.keySet(); // contains all keys of the map
        List<Integer> mapValues = populationMap.values(); // contains all values of the map
        for (Integer key : mapKeys) {
            System.out.println("Value: " + value);
        }
        for (Integer value : mapValues) {
            System.out.println("Value: " + value);
        }

    }

    private static void printEntry(String key, Integer value) {
        System.out.println("Key: " + key + ", Value: " + value);
    }
}

Popularity 10/10 Helpfulness 4/10 Language java

Source: Grepper

Tags: java

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Contributed on Jan 01 2024

Innocent Iguana

0 Answers Avg Quality 2/10

map java

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Map<Integer,String> map=new HashMap<>();
map.put(1,"john");
map.put(2,"kale");
for(Map.Entry<Integer,String> x:map.entrySet()){
System.out.println(x.getKey());
System.out.println(x.getValue());
}

Popularity 10/10 Helpfulness 4/10 Language java

Source: Grepper

Tags: java

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Contributed on May 15 2022

La Van Tho

0 Answers Avg Quality 2/10

Java How to use Map?

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// Map implementation using HashMap
Map<Key, Value> numbers = new HashMap<>();

Popularity 10/10 Helpfulness 3/10 Language java

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Tags: java

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Contributed on May 25 2022

SAMER SAEID

0 Answers Avg Quality 2/10

map declaration in java

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

public class Main {
    public static void main(String[] args) {
        // Declare a map
        Map<String, Integer> map = new HashMap<>();

        // Add key-value pairs to the map
        map.put("apple", 1);
        map.put("banana", 2);
        map.put("orange", 3);

        // Access values using keys
        System.out.println(map.get("apple")); // Output: 1
        System.out.println(map.get("banana")); // Output: 2
        System.out.println(map.get("orange")); // Output: 3
    }
}

Popularity 9/10 Helpfulness 3/10 Language java

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Contributed on Sep 12 2023

YOU.com

0 Answers Avg Quality 2/10

map in java

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