20230530 java.util.Comparator

介绍

• java.util.Comparator
• 接口声明

@FunctionalInterface
public interface Comparator<T>

API

static

• reverseOrder
  • <T extends Comparable<? super T>> Comparator<T> reverseOrder()
• naturalOrder
  • <T extends Comparable<? super T>> Comparator<T> naturalOrder()
• nullsFirst
  • <T> Comparator<T> nullsFirst(Comparator<? super T> comparator)
• nullsLast
  • <T> Comparator<T> nullsLast(Comparator<? super T> comparator)
• comparing
  • <T, U> Comparator<T> comparing(Function<? super T, ? extends U> keyExtractor, Comparator<? super U> keyComparator)
  • <T, U extends Comparable<? super U>> Comparator<T> comparing(Function<? super T, ? extends U> keyExtractor)
• comparingInt
  • <T> Comparator<T> comparingInt(ToIntFunction<? super T> keyExtractor)
• comparingLong
  • <T> Comparator<T> comparingLong(ToLongFunction<? super T> keyExtractor)
• comparingDouble
  • <T> Comparator<T> comparingDouble(ToDoubleFunction<? super T> keyExtractor)

public

• compare
  • int compare(T o1, T o2);
  • 函数式方法

default

• reversed
  • Comparator<T> reversed()
• thenComparing
  • Comparator<T> thenComparing(Comparator<? super T> other)
  • <U> Comparator<T> thenComparing(Function<? super T, ? extends U> keyExtractor, Comparator<? super U> keyComparator)
  • <U extends Comparable<? super U>> Comparator<T> thenComparing(Function<? super T, ? extends U> keyExtractor)
• thenComparingInt
  • Comparator<T> thenComparingInt(ToIntFunction<? super T> keyExtractor)
• thenComparingLong
  • Comparator<T> thenComparingLong(ToLongFunction<? super T> keyExtractor)
• thenComparingDouble
  • Comparator<T> thenComparingDouble(ToDoubleFunction<? super T> keyExtractor)