জাভা

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

public class Main {
  public static void main(String[] args) {
  Map<String, String> user = new HashMap<>();
  user.put("নাম", "মোঃ আরিফ");
  user.put("দেশ", "বাংলাদেশ");

  boolean result = user.containsKey("নাম");

  System.out.println(result);
  }
}

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

public class Main {
  public static void main(String[] args) {
  Map<String, String> user = new HashMap<>();
  user.put("নাম", "মোঃ আরিফ");
  user.put("দেশ", "বাংলাদেশ");

  boolean result = user.containsValue("বাংলাদেশ");

  System.out.println(result);
  }
}

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

public class Main {
  public static void main(String[] args) {
  Map<String, String> user = new HashMap<>();
  user.put("নাম", "মোঃ আরিফ");
  user.put("দেশ", "বাংলাদেশ");

  String result = user.get("নাম");

  System.out.println(result);
  }
}

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

public class Main {
  public static void main(String[] args) {
  Map<String, String> user = new HashMap<>();
  user.put("নাম", "মোঃ আরিফ");
  user.put("দেশ", "বাংলাদেশ");

  String result = user.getOrDefault("শহর", "ঢাকা");

  System.out.println(result);
  }
}

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

public class Main {
  public static void main(String[] args) {
  Map<String, String> user = new HashMap<>();
  user.put("নাম", "মোঃ আরিফ");
  user.put("দেশ", "বাংলাদেশ");
  user.put("শহর", "ঢাকা");

  System.out.println(user);
  }
}

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

public class Main {
  public static void main(String[] args) {
  Map<String, String> user = new HashMap<>();
  user.put("নাম", "মোঃ আরিফ");
  user.put("দেশ", "বাংলাদেশ");

  user.putIfAbsent("শহর", "ঢাকা");

  System.out.println(user);
  }
}

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

public class Main {
  public static void main(String[] args) {
  Map<String, String> user = new HashMap<>();
  user.put("নাম", "মোঃ আরিফ");
  user.put("দেশ", "বাংলাদেশ");

  String result = user.remove("নাম");

  System.out.println(user);
  }
}

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

public class Main {
  public static void main(String[] args) {
  Map<String, String> user = new HashMap<>();
  user.put("নাম", "মোঃ আরিফ");
  user.put("দেশ", "বাংলাদেশ");

  user.replace("নাম", "আরিফ");

  System.out.println(user);
  }
}

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

public class Main {
  public static void main(String[] args) {
  Map<String, String> user = new HashMap<>();
  user.put("নাম", "মোঃ আরিফ");
  user.put("দেশ", "বাংলাদেশ");

  Collection<String> result = user.keySet();

  System.out.println(result);
  }
}

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

public class Main {
  public static void main(String[] args) {
  Map<String, String> user = new HashMap<>();
  user.put("নাম", "মোঃ আরিফ");
  user.put("দেশ", "বাংলাদেশ");

  Collection<String> result = user.values();

  System.out.println(result);
  }
}

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

public class Main {
  public static void main(String[] args) {
  Map<String, String> user = new HashMap<>();
  user.put("নাম", "মোঃ আরিফ");
  user.put("দেশ", "বাংলাদেশ");

  Map<String, String> info = new HashMap<>();
  info.put("নাম", "মোঃ আরিফ");
  info.put("দেশ", "বাংলাদেশ");

  boolean result = user.equals(info);

  System.out.println(result);
  }
}

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

public class Main {
  public static void main(String[] args) {
  Map<String, String> user = new HashMap<>();
  user.put("নাম", "মোঃ আরিফ");
  user.put("দেশ", "বাংলাদেশ");

  int result = user.hashCode();

  System.out.println(result);
  }
}