java - 接收比较器类类型

Question

我有两个比较器。一个用于按第一个字母对单词进行排序(仅用于元音单词的排序)

public class FirstLetterComparator extends ComparatorType {
@Override
public int compare(String o1, String o2) {
    String upperObject1 = o1.toUpperCase();
    String upperObject2 = o2.toUpperCase();

    return upperObject1.charAt(0) - upperObject2.charAt(0);
  }
 }

另一个用于按长度/元音计数系数排序(用于排序类中的所有单词)

public class VowelColComparator extends ComparatorType {
String vowelGroup = "AEIOUaeiou";

@Override
public int compare(String o1, String o2) {
    int vCount1 = getVowelCount(o1);
    int vCount2 = getVowelCount(o2);

    float compareCoef1 = o1.length()/vCount1;
    float compareCoef2 = o2.length()/vCount2;

    return (int)(compareCoef1 - compareCoef2);
}

public int getVowelCount(String word){
    int vowelCount = 0;
    for (int i = 0; i < word.length(); i++){
        char ch = word.charAt(i);
        for (int j = 0; j < vowelGroup.length(); j++){
            char v = vowelGroup.charAt(j);
            if(ch == v)
                vowelCount++;
        }
    }
    return vowelCount;
}

以及他们的父类(super class)

public class ComparatorType implements Comparator<String> {
@Override
public int compare(String o1, String o2) {
    return 0;
  }
} 

在排序类中，我有两种类似的方法来对列表进行排序

public class SortWords {

public static void sortVowelCol(String text, String regex){
    Scanner scanner = new Scanner(text);

    List<String> words = new ArrayList<>();

    System.out.println();
    System.out.println("Task1:");
    while (scanner.hasNext()){
        String word = scanner.next();
        if(word.matches(regex)){
            words.add(word);
        }
    }

    Collections.sort(words, new VowelColComparator());

    int lineCounter = 1;

    System.out.println();
    System.out.println();
    System.out.println("Sorted Words:");
    lineCounter = 1;
    for(String w : words){
        if(lineCounter == 12) {
            System.out.print(w + "\n");
            lineCounter = 0;
        }
        else
            System.out.print(w + " ");
        lineCounter++;
    }

}
public static void sortVowelWords(String text, String regex) {
    Scanner scanner = new Scanner(text);

    List<String> vowelWords = new ArrayList<>();

    System.out.println();
    System.out.println("Task2: ");
    while(scanner.hasNext()){
        String word = scanner.next();
        if(word.matches(regex)){
            vowelWords.add(word);
        }
    }

    Collections.sort(vowelWords, new FirstLetterComparator());

    System.out.println();
    System.out.println();
    System.out.println("Sorted List:");
    int lineCounter = 1;
    for(String w : vowelWords){
        if(lineCounter == 12) {
            System.out.print(w + "\n");
            lineCounter = 0;
        }
        else
            System.out.print(w + " ");
        lineCounter++;
    }
  }
 }

主类

public class Main {

public static void main(String[] args) {
    // write your code here
    SingletonText.getInstance().parse();
    SingletonText.getInstance().print();
      SortWords.sortVowelWords(SingletonText.getInstance().getText().toString(), "^[AEIOUaeiou].*");
    SortWords.sortVowelCol(SingletonText.getInstance().getText().toString(), "^[A-Za-z].*");
  }
 }

问题是如何在 SortWords 类中只创建一个方法而不是两个类似的方法？或者如何获取 Collections.sort 参数的比较器类型？

Answer 1

您可以使用第三个参数来定义要使用的比较器。

public static void sort(String text, String regex, ComparatorType comp) {
    // Code
    Collections.sort(words, comp);
    // Code
}