containsKey()

Java HashMap containsKey() metodi

Misol

Map’da kalit mavjudligini tekshirish:

import java.util.HashMap;

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("Norway", "Oslo");
    capitalCities.put("USA", "Washington DC");
    System.out.println(capitalCities.containsKey("England"));
    System.out.println(capitalCities.containsKey("Canada"));
  }
}

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Ta’rif va qo‘llanilishi

containsKey() metodi map’da ko‘rsatilgan kalitli element mavjud bo‘lsa true, aks holda false qaytaradi.

Sintaksis

public boolean containsKey(Object key)

Parametr qiymatlari

Parametr	Tavsif
key	Majburiy. Qidiriladigan kalit.

Texnik tafsilotlar

Qaytaradi:	Map’da ko‘rsatilgan kalitli element mavjud bo‘lsa `true`, aks holda `false`.

Tegishli sahifalar

Java HashMap darsligi

❮ HashMap metodlari

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