java - 长范围值的查找

Question

我在查找值中查找长整型值并返回相应的值。为了不出现任何与值相关的错误，我将所有值设置为 Long 类型。

这是我的代码

package RestClient;

public class Range {

    public static Long upper;
    public static Long value;

    public Range(Long i, Long j) {
        Range.upper = i;
        Range.value = j;
    }

}



package RestClient;

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

public class Rangelookup {

    public static String Lookup(Long key) {

        NavigableMap<Long, Range> map = new TreeMap<Long, Range>();
        map.put(5045076263000000000L, new Range(5045076263249899999L, 507866L));
        map.put(5045076263249900000L, new Range(5045076263249999999L, 507866L));
        map.put(5045076263250000000L, new Range(5045076263499899999L, 507868L));
        map.put(5045076263499900000L, new Range(5045076263499999999L, 507868L));
        map.put(5045076263500000000L, new Range(5045076263749899999L, 507867L));
        map.put(5045076263749900000L, new Range(5045076263749999999L, 507867L));
        map.put(5045076263750000000L, new Range(5045076263999899999L, 507869L));
        map.put(5045076263999900000L, new Range(5045076263999999999L, 507869L));
        map.put(5045075892250000000L, new Range(5045075892499899999L, 507867L));
        map.put(5045075892499900000L, new Range(5045075892499999999L, 507867L));
        map.put(5045075892000000000L, new Range(5045075892249899999L, 507869L));
        map.put(5045075892249900000L, new Range(5045075892249999999L, 507869L));

        String output = "";
        Map.Entry<Long, Range> entry = map.floorEntry(key);
        if (entry == null) {

            output = "No Entry Found";

        } else if (key <= entry.getValue().upper) {

            output = entry.getValue().value.toString();

        } else {

            output = "No Entry Found";

        }

        System.out.println(output);
        return output;

    }

    public static void main(String[] args) {

        Lookup(5045076263249899985L);

    }

}

请问为什么它没有返回任何值？为什么会出现“找不到条目”的情况？

我可以知道我做错了什么吗？

Answer 1

找到的条目是这个:

map.put(5045076263000000000L, new Range(5045076263249899999L, 507866L));

但是上限值5045075892249999999小于查找键5045076263249899985:

5045075892249999999
      <
5045076263249899985

因此您会得到“找不到条目”。