我想在爪哇执行一个带有类似此示例的自定义索引的矩阵 :
country1 city1 name1 region1 population1
country2 23 5 55 ...
city2 5 9 .
name2 .
region2 .
population2
That is mat[country1][country2] should return 23.
I don t know how I will do it.
您可能不得不使用 Hashmap 或 Hashtable 或 Hashtable 配对键来包含两个索引 : Map<Pair<K1,K2>, V>
You can take a look at that for more informations: Map with two-dimensional key in java
如果您有二维表格, 其行和列总是遵循此顺序, 那么您可以使用列/列的列表 。
例如:
public static final int COUNTRY = 0;
public static final int CITY = 1;
public static final int NAME = 2;
public static final int REGION = 3;
public static final int POPULATION = 4;
另一方面,如果在数据结构中,在两个维度中,可以有两个国家,那么你就可以使用地图。
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