W3School TIY Editor

import java.util.HashMap;

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public class Main {

  public static void main(String[] args) {

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

    capitalCities.put("England", "London");

    capitalCities.put("Germany", "Berlin");

    capitalCities.put("China", "Beijing");

    capitalCities.put("USA", "Washington DC");

    capitalCities.remove("England");

    System.out.println(capitalCities); 

  }

}

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