In Java come trovare l'elenco dei paesi e ordinarlo in ordine alfabetico?

Pubblicato: 2022-03-06

In Java come trovare l'elenco dei paesi? Se hai una delle seguenti domande, sei nel posto giusto.

Il modo migliore per ottenere un elenco di paesi in Java?
Come ottenere l'elenco dei paesi in ordine alfabetico con i nomi corretti?

Iniziamo:

Crea classe Java CrunchifyListOfCountries.java.
Metti sotto il codice nel file.

Ecco una logica:

Useremo la classe Locale che implementa le interfacce Cloneable e Serializable.
La classe Locale fornisce un elenco di API e scorrerà attraverso getCountry() e getDisplayCountry() per ottenere l'elenco di tutti i paesi e codici.
Nel prossimo metodo getCountriesListInAlphabetical(), useremo il metodo List e ListIterator per iterare e il metodo sort() per ordinare l'elenco in ordine alfabetico.

package crunchify . com . java . tutorials ;

import java . util . * ;

/**

* @author Crunchify.com

* Program: In Java how to find list of Countries?

* How to get countries list alphabetically arranged with the correct names?

public class CrunchifyListOfCountries {

public static void main ( String [ ] args ) {

CrunchifyListOfCountries crunchifyObj = new CrunchifyListOfCountries ( ) ;

crunchifyObj . run ( ) ;

}

public void run ( ) {

// getISOCountries: Returns a list of all 2-letter country codes defined in ISO 3166. Can be used to create Locales.

// This method is equivalent to getISOCountries(Locale.IsoCountryCode type) with type Locale.IsoCountryCode.PART1_ALPHA2.

// Note: The Locale class also supports other codes for country (region),

// such as 3-letter numeric UN M.49 area codes.

// Therefore, the list returned by this method does not contain ALL valid codes that can be used to create Locales.

String [ ] crunchifyLocales = Locale . getISOCountries ( ) ;

for ( String crunchifyCountry : crunchifyLocales ) {

// Locale: A Locale object represents a specific geographical, political, or cultural region.

// An operation that requires a Locale to perform its task is called locale-sensitive and uses the Locale to tailor information for the user.

// For example, displaying a number is a locale-sensitive operation— the number should be formatted

// according to the customs and conventions of the user's native country, region, or culture.

Locale crunchifyObj = new Locale ( "" , crunchifyCountry ) ;

System . out . println ( "Here is a Country Code = " + crunchifyObj . getCountry ( )

+ " \t Country Name = " + crunchifyObj . getDisplayCountry ( ) ) ;

}

System . out . println ( "\n\nCountry List in Alphabetical Order:\n" ) ;

getCountriesListInAlphabetical ( ) ;

System . out . println ( "CrunchifyListOfCountries Finished..." ) ;

}

// Country List in Alphabetical Order

public void getCountriesListInAlphabetical ( ) {

List < String > crunchifyList = new ArrayList < String > ( ) ;

String [ ] locales = Locale . getISOCountries ( ) ;

for ( String countryCode : locales ) {

Locale obj = new Locale ( "" , countryCode ) ;

crunchifyList . add ( obj . getDisplayCountry ( ) ) ;

}

// sort(): Sorts the specified list into ascending order,

// according to the natural ordering of its elements.

// All elements in the list must implement the Comparable interface. Furthermore,

// all elements in the list must be mutually comparable

// (that is, e1.compareTo(e2) must not throw a ClassCastException for any elements e1 and e2 in the list).

Collections . sort ( crunchifyList ) ;

// listIterator(): Returns a list iterator over the elements in this list (in proper sequence).

ListIterator < String > crunchifyListIterator = crunchifyList . listIterator ( ) ;

while ( crunchifyListIterator . hasNext ( ) ) {

// next(): Returns the next element in the list and advances the cursor position. This method may be called repeatedly to iterate through the list, or intermixed with calls to previous to go back and forth.

// (Note that alternating calls to next and previous will return the same element repeatedly.)

System . out . println ( crunchifyListIterator . next ( ) ) ;

}

Basta eseguire il programma sopra come un'applicazione Java e vedrai il risultato come di seguito.

IntelliJ IDEA risultato:

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Here is a Country Code = AD Country Name = Andorra

Here is a Country Code = AE Country Name = United Arab Emirates

Here is a Country Code = AF Country Name = Afghanistan

Here is a Country Code = AG Country Name = Antigua & Barbuda

Here is a Country Code = AI Country Name = Anguilla

Here is a Country Code = AL Country Name = Albania

Here is a Country Code = AM Country Name = Armenia

Here is a Country Code = AO Country Name = Angola

Here is a Country Code = AQ Country Name = Antarctica

Here is a Country Code = AR Country Name = Argentina

Here is a Country Code = AS Country Name = American Samoa

Here is a Country Code = AT Country Name = Austria

Here is a Country Code = AU Country Name = Australia

Here is a Country Code = AW Country Name = Aruba

Here is a Country Code = AX Country Name = Å land Islands

Here is a Country Code = AZ Country Name = Azerbaijan

Here is a Country Code = BA Country Name = Bosnia & Herzegovina

Here is a Country Code = BB Country Name = Barbados

Here is a Country Code = BD Country Name = Bangladesh

Here is a Country Code = BE Country Name = Belgium

Here is a Country Code = BF Country Name = Burkina Faso

Here is a Country Code = BG Country Name = Bulgaria

Here is a Country Code = BH Country Name = Bahrain

Here is a Country Code = BI Country Name = Burundi

Here is a Country Code = BJ Country Name = Benin

Here is a Country Code = BL Country Name = St . Barth e lemy

Here is a Country Code = BM Country Name = Bermuda

Here is a Country Code = BN Country Name = Brunei

Here is a Country Code = BO Country Name = Bolivia

Here is a Country Code = BQ Country Name = Caribbean Netherlands

Here is a Country Code = BR Country Name = Brazil

Here is a Country Code = BS Country Name = Bahamas

Here is a Country Code = BT Country Name = Bhutan

Here is a Country Code = BV Country Name = Bouvet Island

Here is a Country Code = BW Country Name = Botswana

Here is a Country Code = BY Country Name = Belarus

Here is a Country Code = BZ Country Name = Belize

Here is a Country Code = CA Country Name = Canada

Here is a Country Code = CC Country Name = Cocos ( Keeling ) Islands

Here is a Country Code = CD Country Name = Congo - Kinshasa

Here is a Country Code = CF Country Name = Central African Republic

Here is a Country Code = CG Country Name = Congo - Brazzaville

Here is a Country Code = CH Country Name = Switzerland

Here is a Country Code = CI Country Name = C o te d ’ Ivoire

Here is a Country Code = CK Country Name = Cook Islands

Here is a Country Code = CL Country Name = Chile

Here is a Country Code = CM Country Name = Cameroon

Here is a Country Code = CN Country Name = China

Here is a Country Code = CO Country Name = Colombia

Here is a Country Code = CR Country Name = Costa Rica

Here is a Country Code = CU Country Name = Cuba

Here is a Country Code = CV Country Name = Cape Verde

Here is a Country Code = CW Country Name = Cura c ao

Here is a Country Code = CX Country Name = Christmas Island

Here is a Country Code = CY Country Name = Cyprus

Here is a Country Code = CZ Country Name = Czechia

Here is a Country Code = DE Country Name = Germany

Here is a Country Code = DJ Country Name = Djibouti

Here is a Country Code = DK Country Name = Denmark

Here is a Country Code = DM Country Name = Dominica

Here is a Country Code = DO Country Name = Dominican Republic

Here is a Country Code = DZ Country Name = Algeria

Here is a Country Code = EC Country Name = Ecuador

Here is a Country Code = EE Country Name = Estonia

Here is a Country Code = EG Country Name = Egypt

Here is a Country Code = EH Country Name = Western Sahara

Here is a Country Code = ER Country Name = Eritrea

Here is a Country Code = ES Country Name = Spain

Here is a Country Code = ET Country Name = Ethiopia

Here is a Country Code = FI Country Name = Finland

Here is a Country Code = FJ Country Name = Fiji

Here is a Country Code = FK Country Name = Falkland Islands

Here is a Country Code = FM Country Name = Micronesia

Here is a Country Code = FO Country Name = Faroe Islands

Here is a Country Code = FR Country Name = France

Here is a Country Code = GA Country Name = Gabon

Here is a Country Code = GB Country Name = United Kingdom

Here is a Country Code = GD Country Name = Grenada

Here is a Country Code = GE Country Name = Georgia

Here is a Country Code = GF Country Name = French Guiana

Here is a Country Code = GG Country Name = Guernsey

Here is a Country Code = GH Country Name = Ghana

Here is a Country Code = GI Country Name = Gibraltar

Here is a Country Code = GL Country Name = Greenland

Here is a Country Code = GM Country Name = Gambia

Here is a Country Code = GN Country Name = Guinea

Here is a Country Code = GP Country Name = Guadeloupe

Here is a Country Code = GQ Country Name = Equatorial Guinea

Here is a Country Code = GR Country Name = Greece

Here is a Country Code = GS Country Name = South Georgia & South Sandwich Islands

Here is a Country Code = GT Country Name = Guatemala

Here is a Country Code = GU Country Name = Guam

Here is a Country Code = GW Country Name = Guinea - Bissau

Here is a Country Code = GY Country Name = Guyana

Here is a Country Code = HK Country Name = Hong Kong SAR China

Here is a Country Code = HM Country Name = Heard & McDonald Islands

Here is a Country Code = HN Country Name = Honduras

Here is a Country Code = HR Country Name = Croatia

Here is a Country Code = HT Country Name = Haiti

Here is a Country Code = HU Country Name = Hungary

Here is a Country Code = ID Country Name = Indonesia

Here is a Country Code = IE Country Name = Ireland

Here is a Country Code = IL Country Name = Israel

Here is a Country Code = IM Country Name = Isle of Man

Here is a Country Code = IN Country Name = India

Here is a Country Code = IO Country Name = British Indian Ocean Territory

Here is a Country Code = IQ Country Name = Iraq

Here is a Country Code = IR Country Name = Iran

Here is a Country Code = IS Country Name = Iceland

Here is a Country Code = IT Country Name = Italy

Here is a Country Code = JE Country Name = Jersey

Here is a Country Code = JM Country Name = Jamaica

Here is a Country Code = JO Country Name = Jordan

Here is a Country Code = JP Country Name = Japan

Here is a Country Code = KE Country Name = Kenya

Here is a Country Code = KG Country Name = Kyrgyzstan

Here is a Country Code = KH Country Name = Cambodia

Here is a Country Code = KI Country Name = Kiribati

Here is a Country Code = KM Country Name = Comoros

Here is a Country Code = KN Country Name = St . Kitts & Nevis

Here is a Country Code = KP Country Name = North Korea

Here is a Country Code = KR Country Name = South Korea

Here is a Country Code = KW Country Name = Kuwait

Here is a Country Code = KY Country Name = Cayman Islands

Here is a Country Code = KZ Country Name = Kazakhstan

Here is a Country Code = LA Country Name = Laos

Here is a Country Code = LB Country Name = Lebanon

Here is a Country Code = LC Country Name = St . Lucia

Here is a Country Code = LI Country Name = Liechtenstein

Here is a Country Code = LK Country Name = Sri Lanka

Here is a Country Code = LR Country Name = Liberia

Here is a Country Code = LS Country Name = Lesotho

Here is a Country Code = LT Country Name = Lithuania

Here is a Country Code = LU Country Name = Luxembourg

Here is a Country Code = LV Country Name = Latvia

Here is a Country Code = LY Country Name = Libya

Here is a Country Code = MA Country Name = Morocco

Here is a Country Code = MC Country Name = Monaco

Here is a Country Code = MD Country Name = Moldova

Here is a Country Code = ME Country Name = Montenegro

Here is a Country Code = MF Country Name = St . Martin

Here is a Country Code = MG Country Name = Madagascar

Here is a Country Code = MH Country Name = Marshall Islands

Here is a Country Code = MK Country Name = North Macedonia

Here is a Country Code = ML Country Name = Mali

Here is a Country Code = MM Country Name = Myanmar ( Burma )

Here is a Country Code = MN Country Name = Mongolia

Here is a Country Code = MO Country Name = Macao SAR China

Here is a Country Code = MP Country Name = Northern Mariana Islands

Here is a Country Code = MQ Country Name = Martinique

Here is a Country Code = MR Country Name = Mauritania

Here is a Country Code = MS Country Name = Montserrat

Here is a Country Code = MT Country Name = Malta

Here is a Country Code = MU Country Name = Mauritius

Here is a Country Code = MV Country Name = Maldives

Here is a Country Code = MW Country Name = Malawi

Here is a Country Code = MX Country Name = Mexico

Here is a Country Code = MY Country Name = Malaysia

Here is a Country Code = MZ Country Name = Mozambique

Here is a Country Code = NA Country Name = Namibia

Here is a Country Code = NC Country Name = New Caledonia

Here is a Country Code = NE Country Name = Niger

Here is a Country Code = NF Country Name = Norfolk Island

Here is a Country Code = NG Country Name = Nigeria

Here is a Country Code = NI Country Name = Nicaragua

Here is a Country Code = NL Country Name = Netherlands

Here is a Country Code = NO Country Name = Norway

Here is a Country Code = NP Country Name = Nepal

Here is a Country Code = NR Country Name = Nauru

Here is a Country Code = NU Country Name = Niue

Here is a Country Code = NZ Country Name = New Zealand

Here is a Country Code = OM Country Name = Oman

Here is a Country Code = PA Country Name = Panama

Here is a Country Code = PE Country Name = Peru

Here is a Country Code = PF Country Name = French Polynesia

Here is a Country Code = PG Country Name = Papua New Guinea

Here is a Country Code = PH Country Name = Philippines

Here is a Country Code = PK Country Name = Pakistan

Here is a Country Code = PL Country Name = Poland

Here is a Country Code = PM Country Name = St . Pierre & Miquelon

Here is a Country Code = PN Country Name = Pitcairn Islands

Here is a Country Code = PR Country Name = Puerto Rico

Here is a Country Code = PS Country Name = Palestinian Territories

Here is a Country Code = PT Country Name = Portugal

Here is a Country Code = PW Country Name = Palau

Here is a Country Code = PY Country Name = Paraguay

Here is a Country Code = QA Country Name = Qatar

Here is a Country Code = RE Country Name = R e union

Here is a Country Code = RO Country Name = Romania

Here is a Country Code = RS Country Name = Serbia

Here is a Country Code = RU Country Name = Russia

Here is a Country Code = RW Country Name = Rwanda

Here is a Country Code = SA Country Name = Saudi Arabia

Here is a Country Code = SB Country Name = Solomon Islands

Here is a Country Code = SC Country Name = Seychelles

Here is a Country Code = SD Country Name = Sudan

Here is a Country Code = SE Country Name = Sweden

Here is a Country Code = SG Country Name = Singapore

Here is a Country Code = SH Country Name = St . Helena

Here is a Country Code = SI Country Name = Slovenia

Here is a Country Code = SJ Country Name = Svalbard & Jan Mayen

Here is a Country Code = SK Country Name = Slovakia

Here is a Country Code = SL Country Name = Sierra Leone

Here is a Country Code = SM Country Name = San Marino

Here is a Country Code = SN Country Name = Senegal

Here is a Country Code = SO Country Name = Somalia

Here is a Country Code = SR Country Name = Suriname

Here is a Country Code = SS Country Name = South Sudan

Here is a Country Code = ST Country Name = S a o Tom e & Pr i ncipe

Here is a Country Code = SV Country Name = El Salvador

Here is a Country Code = SX Country Name = Sint Maarten

Here is a Country Code = SY Country Name = Syria

Here is a Country Code = SZ Country Name = Eswatini

Here is a Country Code = TC Country Name = Turks & Caicos Islands

Here is a Country Code = TD Country Name = Chad

Here is a Country Code = TF Country Name = French Southern Territories

Here is a Country Code = TG Country Name = Togo

Here is a Country Code = TH Country Name = Thailand

Here is a Country Code = TJ Country Name = Tajikistan

Here is a Country Code = TK Country Name = Tokelau

Here is a Country Code = TL Country Name = Timor - Leste

Here is a Country Code = TM Country Name = Turkmenistan

Here is a Country Code = TN Country Name = Tunisia

Here is a Country Code = TO Country Name = Tonga

Here is a Country Code = TR Country Name = Turkey

Here is a Country Code = TT Country Name = Trinidad & Tobago

Here is a Country Code = TV Country Name = Tuvalu

Here is a Country Code = TW Country Name = Taiwan

Here is a Country Code = TZ Country Name = Tanzania

Here is a Country Code = UA Country Name = Ukraine

Here is a Country Code = UG Country Name = Uganda

Here is a Country Code = UM Country Name = U . S . Outlying Islands

Here is a Country Code = US Country Name = United States

Here is a Country Code = UY Country Name = Uruguay

Here is a Country Code = UZ Country Name = Uzbekistan

Here is a Country Code = VA Country Name = Vatican City

Here is a Country Code = VC Country Name = St . Vincent & Grenadines

Here is a Country Code = VE Country Name = Venezuela

Here is a Country Code = VG Country Name = British Virgin Islands

Here is a Country Code = VI Country Name = U . S . Virgin Islands

Here is a Country Code = VN Country Name = Vietnam

Here is a Country Code = VU Country Name = Vanuatu

Here is a Country Code = WF Country Name = Wallis & Futuna

Here is a Country Code = WS Country Name = Samoa

Here is a Country Code = YE Country Name = Yemen

Here is a Country Code = YT Country Name = Mayotte

Here is a Country Code = ZA Country Name = South Africa

Here is a Country Code = ZM Country Name = Zambia

Here is a Country Code = ZW Country Name = Zimbabwe

Country List in Alphabetical Order :

Afghanistan

Albania

Algeria

American Samoa

Andorra

Angola

Anguilla

Antarctica

Antigua & Barbuda

Argentina

Armenia

Aruba

Australia

Austria

Azerbaijan

Bahamas

Bahrain

Bangladesh

Barbados

Belarus

Belgium

Belize

Benin

Bermuda

Bhutan

Bolivia

Bosnia & Herzegovina

Botswana

Bouvet Island

Brazil

British Indian Ocean Territory

British Virgin Islands

Brunei

Bulgaria

Burkina Faso

Burundi

Cambodia

Cameroon

Canada

Cape Verde

Caribbean Netherlands

Cayman Islands

Central African Republic

Chad

Chile

China

Christmas Island

Cocos ( Keeling ) Islands

Colombia

Comoros

Congo - Brazzaville

Congo - Kinshasa

Cook Islands

Costa Rica

Croatia

Cuba

Cura c ao

Cyprus

Czechia

C o te d ’ Ivoire

Denmark

Djibouti

Dominica

Dominican Republic

Ecuador

Egypt

El Salvador

Equatorial Guinea

Eritrea

Estonia

Eswatini

Ethiopia

Falkland Islands

Faroe Islands

Fiji

Finland

France

French Guiana

French Polynesia

French Southern Territories

Gabon

Gambia

Georgia

Germany

Ghana

Gibraltar

Greece

Greenland

Grenada

Guadeloupe

Guam

Guatemala

Guernsey

Guinea

Guinea - Bissau

Guyana

Haiti

Heard & McDonald Islands

Honduras

Hong Kong SAR China

Hungary

Iceland

India

Indonesia

Iran

Iraq

Ireland

Isle of Man

Israel

Italy

Jamaica

Japan

Jersey

Jordan

Kazakhstan

Kenya

Kiribati

Kuwait

Kyrgyzstan

Laos

Latvia

Lebanon

Lesotho

Liberia

. . .

And so on . . . .

CrunchifyListOfCountries Finished . . .

Process finished with exit code 0

Fammi sapere se riscontri problemi durante l'esecuzione del programma sopra.

Buona codifica.