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Java How to use Map?

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SAMER SAEID answered on April 28, 2020 Popularity 10/10 Helpfulness 3/10

answer Java How to use Map?

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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

Source: Grepper

Tags: java

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Contributed on May 25 2022

SAMER SAEID

0 Answers Avg Quality 2/10

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create map java

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Map<String, Integer> map = new HashMap<>();

Popularity 10/10 Helpfulness 7/10 Language java

Source: Grepper

Tags: java

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Contributed on Jan 15 2021

Victorious Vicuña

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java create map

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Map <Integer, Point2D.Double> hm = new HashMap<Integer, Point2D>();
hm.put(1, new Point2D.Double(50, 50));

Popularity 10/10 Helpfulness 4/10 Language java

Source: stackoverflow.com

Tags: java

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Contributed on Apr 28 2020

Worrisome Wolverine

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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

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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

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Contributed on Jan 06 2021

Obedient Ocelot

0 Answers Avg Quality 2/10

create map java

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Map <Integer, Point2D.Double> hm = new HashMap<Integer, Point2D>();
hm.put(1, new Point2D.Double(50, 50));

Popularity 9/10 Helpfulness 2/10 Language java

Source: coders911.org

Tags: java

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Contributed on Mar 26 2022

Tense Tortoise

0 Answers Avg Quality 2/10

Java How to use Map?

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