@Test
public void testPermutations() {
// Permutations perm = new Permutations();
// List<Character> inputList = new ArrayList<Character>();
// inputList.add('v');
// inputList.add('a');
// inputList.add('e');
// inputList.add('y');
// perm.printPermutations(inputList);
try {
Integer iObj = Integer.parseInt("9999");
} catch (NumberFormatException nfe) {
}
Country indiaCountry = new Country(1, "India");
Country indiaCountry2 = new Country(1, "India");
Country chinaCountry = new Country(3, "USA");
Country nepalCountry = new Country(4, "Russia");
Country bhutanCountry = new Country(2, "Japan");
List<Country> listOfCountries = new ArrayList<Country>();
listOfCountries.add(indiaCountry);
listOfCountries.add(indiaCountry2);
listOfCountries.add(chinaCountry);
listOfCountries.add(nepalCountry);
listOfCountries.add(bhutanCountry);
System.out.println("Before Sort by id : ");
for (int i = 0; i < listOfCountries.size(); i++) {
Country country = (Country) listOfCountries.get(i);
System.out.println(
"Country Id: "
+ country.getCountryId()
+ "||"
+ "Country name: "
+ country.getCountryName());
}
Set<Country> countrySet =
new TreeSet<>(
(country1, country2) ->
(country1.getCountryId() < country2.getCountryId())
? -1
: ((country1.getCountryId() > country2.getCountryId()) ? 1 : 0));
countrySet.addAll(listOfCountries);
List<Country> sortedCountries = new ArrayList<>(countrySet);
for (int i = 0; i < sortedCountries.size(); i++) {
Country country = (Country) sortedCountries.get(i);
System.out.println(
"Country Id: "
+ country.getCountryId()
+ "|| "
+ "Country name: "
+ country.getCountryName());
}
Collections.sort(
listOfCountries,
(country1, country2) ->
(country1.getCountryId() < country2.getCountryId())
? -1
: (country1.getCountryId() > country2.getCountryId()) ? 1 : 0);
System.out.println("After Sort by id: ");
for (int i = 0; i < listOfCountries.size(); i++) {
Country country = (Country) listOfCountries.get(i);
System.out.println(
"Country Id: "
+ country.getCountryId()
+ "|| "
+ "Country name: "
+ country.getCountryName());
}
// Sort by countryName
Collections.sort(
listOfCountries,
new Comparator<Country>() {
@Override
public int compare(Country o1, Country o2) {
return o1.getCountryName().compareTo(o2.getCountryName());
}
});
System.out.println("After Sort by name: ");
for (int i = 0; i < listOfCountries.size(); i++) {
Country country = (Country) listOfCountries.get(i);
System.out.println(
"Country Id: "
+ country.getCountryId()
+ "|| "
+ "Country name: "
+ country.getCountryName());
}
}
