[英]Sort several 'linked' Lists
I have 3 lists so the order of their elements is important: 我有3个列表,因此它们的元素顺序很重要:
names: [a, b, c, d]
files: [a-file, b-file, c-file, d-file]
counts: [a-count, b-count, c-count, d-count]
I need to sort all of them alphabetically based on the List<String> names
elements. 我需要根据
List<String> names
元素按字母顺序对它们进行排序。
Can someone explain me how to do this? 有人可以解释我该怎么做吗?
Create a class to hold the tuple: 创建一个类来容纳元组:
class NameFileCount {
String name;
File file;
int count;
public NameFileCount(String name, File file, int count) {
...
}
}
Then group the data from the three lists into a single list of this class: 然后将三个列表中的数据分组到此类的单个列表中:
List<NameFileCount> nfcs = new ArrayList<>();
for (int i = 0; i < names.size(); i++) {
NameFileCount nfc = new NameFileCount(
names.get(i),
files.get(i),
counts.get(i)
);
nfcs.add(nfc);
}
And sort this list by name
, using a custom comparator: 然后使用自定义比较器按
name
对列表进行排序:
Collections.sort(nfcs, new Comparator<NameFileCount>() {
public int compare(NameFileCount x, NameFileCount y) {
return x.name.compareTo(y.name);
}
});
(Property accessors, null checking, etc omitted for brevity.) (为简便起见,省略了属性访问器,空检查等。)
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