[英]Store data in dynamic 2D Array
I have a list of people like this List<People>
. 我有一个这样的人
List<People>
。 Now I have to split this list by the gender of each person. 现在,我必须按每个人的性别来拆分此列表。 After that I want to have one 2D Object.
之后,我想要一个2D对象。 In the first dimenson is the gender and in the second the people itself.
第一个维度是性别,第二个维度是人本身。
My problem now is that I do not know how to store the data. 我现在的问题是我不知道如何存储数据。 I have to add and remove items from the second dimenson later and it would be nice if can get the Items with
[][] or (gender, position)
. 我稍后必须添加和删除第二个维度中的项目,如果可以使用
[][] or (gender, position)
获得项目,那就太好了。 I thought about nested ArrayLists but I think that is an unpleasant solution. 我想到了嵌套的ArrayList,但是我认为这是一个不愉快的解决方案。 How would you solve this?
您将如何解决?
UPDATE UPDATE
If you want that notation, use a Map of arrays encapsulated in a "custom" collection of objects like this: 如果需要这种表示法,请使用封装在“自定义”对象集合中的数组映射,如下所示:
enum Gender {
MALE, FEMALE
}
class MyInfo {
private Map<Gender, List<Person>> myInfo;
public MyInfo(List<Person> females, List<Person> males) {
myInfo = new HashMap<Gender, List<Person>>();
myInfo.put(Gender.MALE, males);
myInfo.put(Gender.FEMALE, females);
}
public Person get(Gender gender, int index) {
myInfo.get(gender).get(index);
}
}
and refer each person as: 并将每个人称为:
Person selectedPerson = myInfo.get(Gender.MALE, 100);
I would create my own data structure like this: 我将创建自己的数据结构,如下所示:
public class PeopleList {
private List<Person> men;
private List<Person> women;
public Person get(char gender, int position){
switch (gender){
case 'M':
return men.elementAt(position);
case 'W':
return women.elementAt(position);
}
}
public void insert(Person p){
switch(p.getGender()){
case 'M':
men.insert(p);
break;
case 'W':
women.insert(p);
break;
}
}
}
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