collections.sort custom comparator
ArrayList<Employee> employees = getUnsortedEmployeeList();
Comparator<Employee> compareById = (Employee o1, Employee o2) -> o1.getId().compareTo( o2.getId() );
Collections.sort(employees, compareById);
Collections.sort(employees, compareById.reversed());sorting collections with comparator java
public class MarvelComparator {
public static void main(String... comparator) {
List<String> marvelHeroes = new ArrayList<>();
marvelHeroes.add("SpiderMan ");
marvelHeroes.add("Wolverine ");
marvelHeroes.add("Xavier ");
marvelHeroes.add("Cyclops ");
Collections.sort(marvelHeroes, new Comparator<String>() {
@Override
public int compare(String hero1, String hero2) {
return hero1.compareTo(hero2);
}
});
Collections.sort(marvelHeroes, (m1, m2) -> m1.compareTo(m2));
Collections.sort(marvelHeroes, Comparator.naturalOrder());
marvelHeroes.forEach(System.out::print);
}
}collections.sort custom comparator
ArrayList<Employee> employees = getUnsortedEmployeeList();
Comparator<Employee> compareById = (Employee o1, Employee o2) -> o1.getId().compareTo( o2.getId() );
Collections.sort(employees, compareById);
Collections.sort(employees, compareById.reversed());sorting collections with comparator java
public class MarvelComparator {
public static void main(String... comparator) {
List<String> marvelHeroes = new ArrayList<>();
marvelHeroes.add("SpiderMan ");
marvelHeroes.add("Wolverine ");
marvelHeroes.add("Xavier ");
marvelHeroes.add("Cyclops ");
Collections.sort(marvelHeroes, new Comparator<String>() {
@Override
public int compare(String hero1, String hero2) {
return hero1.compareTo(hero2);
}
});
Collections.sort(marvelHeroes, (m1, m2) -> m1.compareTo(m2));
Collections.sort(marvelHeroes, Comparator.naturalOrder());
marvelHeroes.forEach(System.out::print);
}
}Copyright © 2021 Codeinu
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