NavigableMap Demo

import java.util.NavigableMap;
import java.util.TreeMap;

public class NavigableMapExample {
    public static void main(String[] args) {
        NavigableMap<Integer, String> map = new TreeMap<>();

        // 添加元素
        map.put(1, "One");
        map.put(2, "Two");
        map.put(3, "Three");
        map.put(4, "Four");
        map.put(5, "Five");

        // 获取小于给定键的最大键值对
        System.out.println("Lower Entry (3): " + map.lowerEntry(3));

        // 获取小于或等于给定键的最大键值对
        System.out.println("Floor Entry (3): " + map.floorEntry(3));

        // 获取大于给定键的最小键值对
        System.out.println("Higher Entry (3): " + map.higherEntry(3));

        // 获取大于或等于给定键的最小键值对
        System.out.println("Ceiling Entry (3): " + map.ceilingEntry(3));

        // 获取并移除第一个键值对
        System.out.println("Poll First Entry: " + map.pollFirstEntry());

        // 获取并移除最后一个键值对
        System.out.println("Poll Last Entry: " + map.pollLastEntry());

        // 获取降序视图的 NavigableMap
        NavigableMap<Integer, String> descendingMap = map.descendingMap();
        System.out.println("Descending Map: " + descendingMap);
    }
}