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Java
Collections
Collections
Потокобезопасные коллекции
Comparator vs Comparable (Сортировка 1, -1, 0)
Comparator
Comparable
1
interface
Interface
2
Когда мы хотим менять характеристики для сравнения
Когда мы хотим сравнивать по главным характеристикам
3
compare(YourObject arg1, YourObject arg2)
compareTo(YourObject arg1)
4
public class PLevelComparator implements Comparator<P> {
@Override
public int compare(P p1, P p2) {
return Integer.compare(p1.getRanking(), p2.getRanking());
}
}
public class PAgeComparator implements Comparator<P> {
@Override
public int compare(P p1, P p2) {
return Integer.compare(p1.getAge(), p2.getAge());
}
}
public class P implements Comparable<P> {
@Override
public int compareTo(P op) {
return Integer.compare(getLevel(), op.getLevel());
}
}
5
PlayerRankingComparator playerComparator = new PlayerRankingComparator();
Collections.sort(footballTeam, playerComparator);
PlayerAgeComparator playerComparator = new PlayerAgeComparator();
Collections.sort(footballTeam, playerComparator);
P p1 = new P("Vlad", 4);
P p2 = new P("Lizard", 3);
return p1.compareTo(p2);
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