JAVA

new hashmap java

Map<String, String> myMap = new HashMap<String, String>() {{
        put("a", "b");
        put("c", "d");
    }};

declare hashmap java

//remember to first import java.util.*; first

//you can swap out string or integer for other data types
Map<String, Integer> d = new HashMap<>();

declare a hashmap in java

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

Create HashMap in Java

import java.util.HashMap;

class Main {
  public static void main(String[] args) {

    // create a hashmap
    HashMap<String, Integer> languages = new HashMap<>();

    // add elements to hashmap
    languages.put("Java", 8);
    languages.put("JavaScript", 1);
    languages.put("Python", 3);
    System.out.println("HashMap: " + languages);
  }
}

new hashmap java

// this works for up to 10 elements:
Map<String, String> test1 = Map.of(
    "a", "b",
    "c", "d"
);

// this works for any number of elements:
import static java.util.Map.entry;    
Map<String, String> test2 = Map.ofEntries(
    entry("a", "b"),
    entry("c", "d")
);