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Returns the countries name given country code and vice versa
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‎GoogleAndriodPrep_1/CodeAndNameOfCountry.txt

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Afghanistan,AFG
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Åland Islands,ALA
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Albania,ALB
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Algeria,DZA
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American Samoa,ASM
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Andorra,AND
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Angola,AGO
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Anguilla,AIA
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Antigua and Barbuda,ATG
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Argentina,ARG
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Armenia,ARM
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Aruba,ABW
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Australia,AUS
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Austria,AUT
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Azerbaijan,AZE
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Bahamas,BHS
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Bahrain,BHR
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Bangladesh,BGD
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Barbados,BRB
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Belarus,BLR
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Belgium,BEL
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Belize,BLZ
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Benin,BEN
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Bermuda,BMU
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Bhutan,BTN
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Bolivia (Plurinational State of),BOL
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Bonaire Sint Eustatius and Saba, BES
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Bosnia and Herzegovina,BIH
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Botswana,BWA
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Brazil,BRA
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British Virgin Islands,VGB
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Brunei Darussalam,BRN
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Bulgaria,BGR
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Burkina Faso,BFA
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Burundi,BDI
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Cabo Verde,CPV
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Cambodia,KHM
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Cameroon,CMR
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Canada,CAN
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Cayman Islands,CYM
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Central African Republic,CAF
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Chad,TCD
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Chile,CHL
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China,CHN
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Hong Kong,HKG
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Macao,MAC
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Colombia,COL
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Comoros,COM
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Congo,COG
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Cook Islands,COK
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Costa Rica,CRI
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Côte d'Ivoire,CIV
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Croatia,HRV
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Cuba,CUB
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Curaçao,CUW
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Czech Republic,CZE
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Democratic People's Republic of Korea,PRK
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Democratic Republic of the Congo,COD
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Denmark,DNK
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Djibouti,DJI
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Dominica,DMA
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Dominican Republic,DOM
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Ecuador,ECU
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Egypt,EGY
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El Salvador,SLV
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Equatorial Guinea,GNQ
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Eritrea,ERI
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Estonia,EST
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Ethiopia,ETH
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Faeroe Islands,FRO
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Falkland Islands (Malvinas),FLK
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Fiji,FJI
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Finland,FIN
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France,FRA
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French Guiana,GUF
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French Polynesia,PYF
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Gabon,GAB
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Gambia,GMB
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Georgia,GEO
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Germany,DEU
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Ghana,GHA
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Gibraltar,GIB
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Greece,GRC
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Greenland,GRL
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Grenada,GRD
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Guadeloupe,GLP
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Guam,GUM
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Guatemala,GTM
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Guernsey,GGY
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Guinea,GIN
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Guinea-Bissau,GNB
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Guyana,GUY
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Haiti,HTI
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Holy See,VAT
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Honduras,HND
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Hungary,HUN
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Iceland,ISL
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India,IND
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Indonesia,IDN
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Iran (Islamic Republic of),IRN
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Iraq,IRQ
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Ireland,IRL
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Isle of Man,IMN
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Israel,ISR
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Italy,ITA
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Jamaica,JAM
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Japan,JPN
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Jersey,JEY
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Jordan,JOR
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Kazakhstan,KAZ
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Kenya,KEN
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Kiribati,KIR
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Kuwait,KWT
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Kyrgyzstan,KGZ
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Lao People's Democratic Republic,LAO
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Latvia,LVA
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Lebanon,LBN
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Lesotho,LSO
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Liberia,LBR
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Libya,LBY
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Liechtenstein,LIE
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Lithuania,LTU
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Luxembourg,LUX
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Madagascar,MDG
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Malawi,MWI
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Malaysia,MYS
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Maldives,MDV
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Mali,MLI
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Malta,MLT
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Marshall Islands,MHL
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Martinique,MTQ
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Mauritania,MRT
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Mauritius,MUS
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Mayotte,MYT
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Mexico,MEX
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Micronesia (Federated States of),FSM
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Monaco,MCO
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Mongolia,MNG
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Montenegro,MNE
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Montserrat,MSR
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Morocco,MAR
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Mozambique,MOZ
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Myanmar,MMR
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Namibia,NAM
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Nauru,NRU
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Nepal,NPL
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Netherlands,NLD
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New Caledonia,NCL
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New Zealand,NZL
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Nicaragua,NIC
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Niger,NER
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Nigeria,NGA
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Niue,NIU
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Norfolk Island,NFK
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Northern Mariana Islands,MNP
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Norway,NOR
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Oman,OMN
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Pakistan,PAK
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Palau,PLW
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Panama,PAN
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Papua New Guinea,PNG
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Paraguay,PRY
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Peru,PER
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Philippines,PHL
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Pitcairn,PCN
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Poland,POL
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Portugal,PRT
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Puerto Rico,PRI
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Qatar,QAT
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Republic of Korea,KOR
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Republic of Moldova,MDA
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Réunion,REU
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Romania,ROU
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Russian Federation,RUS
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Rwanda,RWA
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Saint Barthélemy,BLM
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Saint Helena,SHN
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Saint Kitts and Nevis,KNA
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Saint Lucia,LCA
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Saint Martin (French part),MAF
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Saint Pierre and Miquelon,SPM
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Saint Vincent and the Grenadines,VCT
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Samoa,WSM
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San Marino,SMR
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Sao Tome and Principe,STP
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Saudi Arabia,SAU
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Senegal,SEN
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Serbia,SRB
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Seychelles,SYC
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Sierra Leone,SLE
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Singapore,SGP
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Sint Maarten (Dutch part),SXM
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Slovakia,SVK
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Slovenia,SVN
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Solomon Islands,SLB
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Somalia,SOM
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South Africa,ZAF
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South Sudan,SSD
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Spain,ESP
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Sri Lanka,LKA
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State of Palestine,PSE
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Sudan,SDN
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Suriname,SUR
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Svalbard and Jan Mayen Islands,SJM
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Swaziland,SWZ
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Sweden,SWE
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Switzerland,CHE
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Syrian Arab Republic,SYR
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Tajikistan,TJK
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Thailand,THA
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The former Yugoslav Republic of Macedonia,MKD
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Timor-Leste,TLS
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Togo,TGO
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Tokelau,TKL
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Tonga,TON
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Trinidad and Tobago,TTO
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Tunisia,TUN
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Turkey,TUR
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Turkmenistan,TKM
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Turks and Caicos Islands,TCA
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Tuvalu,TUV
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Uganda,UGA
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Ukraine,UKR
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United Arab Emirates,ARE
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United Kingdom of Great Britain and Northern Ireland,GBR
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United Republic of Tanzania,TZA
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United States of America,USA
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United States Virgin Islands,VIR
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Uruguay,URY
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Uzbekistan,UZB
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Vanuatu,VUT
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Venezuela (Bolivarian Republic of),VEN
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Viet Nam,VNM
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Wallis and Futuna Islands,WLF
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Western Sahara,ESH
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Yemen,YEM
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Zambia,ZMB
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Zimbabwe,ZWE

‎GoogleAndriodPrep_1/ISO_HashMap.java

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/*
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* @author Remel Kabir
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*
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* This is preparation practice program for google's Applied CS with Android.
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*
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* This program takes in a three-letter country code and returns the full name of the country to which it belongs. For example:
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Input | Output
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----- | ----------------------------------------------------
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GBR | United Kingdom of Great Britain and Northern Ireland
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IDN | Indonesia
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IND | India
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As an extension, if the input is greater than 3 letters, it is consider as the name of a country,
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and returns the three-letter code for it. Write a helpful error message if the input is neither a valid code nor a country name.
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*/
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import java.io.*;
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import java.util.*;
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public class ISO_HashMap {
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private static HashMap<String, String> codeName = new HashMap<String, String>(); //creating a HashMap to put the name and code of the country.
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public static void main(String args[]){
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String fileName= "CodeAndNameOfCountry.txt"; //initailzing the filename to the txt file that contains all the code and name.
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String line = null; // variable to read one line at a time from the txt file.
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try{
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FileReader fileReader = new FileReader(fileName); //reads the .txt file
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BufferedReader bufferedReader = new BufferedReader(fileReader); // this object will import method that reads the .txt file line by line.
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while((line=bufferedReader.readLine()) != null ){ // keeps reading till every line has been processed.
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//Temporary array and variable to process all the codes and names.
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String[] tempCodeName = line.split(","); // splits the string if there is a comma in the line.
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String CountryName = tempCodeName[0];// first String of the line is the name of the country
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String CountryCode = tempCodeName[1];// second String of the line is the Code of the Country
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//HashMap Entry adding.
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codeName.put(CountryCode, CountryName); //adds the name and the code of the country in the HashMap, Code as the key and Name as the value;
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}//end of while loop
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bufferedReader.close();// Closing the file after reading it.
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}//end of try
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catch(FileNotFoundException ex) {
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System.out.println("File Not Found '" + fileName + "'");
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}//end of catch
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catch(IOException ex) {
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System.out.println("Error '" + fileName + "'");
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}//end of catch
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inputOutput();
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}//end of main
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private static void inputOutput() {
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Scanner scan = new Scanner(System.in);// scan object for scanning.
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String inputForInfo;// user's input
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System.out.println("Please Enter a three Digit Country Code to get the full name of the country:");
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inputForInfo= scan.nextLine();//read the line that user inputed and saves it in the variable InputForInfo
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int lengthOfInput = inputForInfo.length(); // length of the input to check if the user input anything other than a three digit country code.
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if(!validInput(inputForInfo)){
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System.out.println("Not a valid Input. It's neither a code of a country nor it's name ");
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}//if
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if(lengthOfInput == 3){
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System.out.println(getCountry(inputForInfo));
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}//if
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else
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System.out.println(getCode(inputForInfo));
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}//end of inputOutput
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//To check if the input is either a valid code or country's name
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private static boolean validInput(String input){
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//returns true if the the three digits code is either a name or code of a country.
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if(codeName.containsValue(input)) return true;
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if(codeName.containsKey(input)) return true;
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return false; // else returns false.
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}//end of validInput
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// returns the code if country's name is entered.
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private static String getCode(String input){
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for (Map.Entry<String, String> en : codeName.entrySet()) {
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if (en.getValue().equals(input)) {
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return en.getKey();
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}//if
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}//end of for
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return "Code of the country not found";
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}//end of getCode
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//returns the name of the country if correct code entered
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private static String getCountry(String input){
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if(!codeName.containsKey(input)) return "country not Found";
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return codeName.get(input);
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}
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}//end of class

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