Easily Sorting Collections of Objects
Question:
When working with lists of objects (e.g., Person), how can we flexibly sort by different properties (e.g., name, age, or country)?
Answer:
While the Comparable interface allows sorting by a single property, a more versatile approach is to use custom comparators with the Collections.sort method. An example for sorting a Person class:
public class FlexiblePersonComparator implements Comparator<person> { public enum Order { Name, Age, Country } private Order sortingBy = Order.Name; @Override public int compare(Person person1, Person person2) { switch (sortingBy) { case Name: return person1.name.compareTo(person2.name); case Age: return person1.age.compareTo(person2.age); case Country: return person1.country.compareTo(person2.country); } throw new RuntimeException("Practically unreachable code, can't be thrown"); } public void setSortingBy(Order sortBy) { this.sortingBy = sortBy; } }</person>
Utilizing the comparator:
public void sortPersonsBy(FlexiblePersonComparator.Order sortingBy) { List<person> persons = this.persons; // Useless line for clarification FlexiblePersonComparator comparator = new FlexiblePersonComparator(); comparator.setSortingBy(sortingBy); Collections.sort(persons, comparator); // Sorting the list }</person>
By utilizing custom comparators, you gain the flexibility to sort collections of objects by any desired property, providing a convenient and versatile solution for sorting complex data structures.
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