SrortedMap接口

package java.util;

public interface SortedMap<K, V> extends Map<K, V> {
    //排序使用的Comparator比较器
    Comparator<? super K> comparator();
    //返回一个视图，范围是左闭右开区间[fromkey,tokey)
    SortedMap<K, V> subMap(K fromKey, K toKey);
    //返回视图，[最小key,tokey)
    SortedMap<K, V> headMap(K toKey);
    //返回视图，[fromkey,最大key]
    SortedMap<K, V> tailMap(K fromKey);
    //返回最小key
    K firstKey();
    //返回最大key
    K lastKey();
    //返回视图集合************************************************************//
    //Returns a {@link Set} view of the keys contained in this map.
    Set<K> keySet();
    //Returns a {@link Collection} view of the values contained in this map.
    Collection<V> values();
    //Returns a {@link Set} view of the mappings contained in this map.
    Set<Map.Entry<K, V>> entrySet();
}