需要帮助按字母顺序对文本文件进行排序

Question

好的，所以我需要列出未排序的单词：

freddy
at
elephant
whoooooodat
alice
tommy
bobby
it
at
about

并按长度和字母顺序对其进行排序：

at
at
it
about
alice
bobby
tommy
freddy
elephant
whoooooodat

我可以用 Collections.sort(words) 对其进行排序并得到：

at
it
at
alice
tommy
bobby
about
freddy
elephant
whoooooodat

我只需要按字母顺序排列单词。

这是我当前的代码：

public class Lab1
{
    public static void main( String args[] ) throws IOException
    {
        Scanner file = new Scanner(new File("lab1.dat"));

        ArrayList<Word> words = new ArrayList<Word>();
        while(file.hasNext())
        {
            //add in a new Word to words
            words.add(new Word(file.next()));
        }

        //can sort the words with this 
        Collections.sort(words);


        //make letter lower case and compare asii values
        // need to sort the words by alphabetically 
        /*
        for (int i = 0; i < words.size()-1 ; i++)
        {
            int min = i; 
            for(int j= i+1; j < words.size(); j++){
                String minstring = (String)words.get(min);
            if((((String)words.get(min)).toLowerCase()).compareTo(words.get(j)) > 0)
                min =j;



            }// end of inner loop

            if (min!= i){
            Word temp = words.get(min); 
            words.set(min,words.get(i));
            words.set(i,temp);
            }// end of sort if

        }   //end of outer loop
*/
        //print out words
        for (int j =0; j < words.size(); j++)
        System.out.println(words.get(j));
    }
}

 //Second Part
public class Word implements Comparable<Word>
{
    private String word;

    //constructors

    public Word()
    {
        word = "";
    }
    public Word(String a)
    {
        word =a;
    }



    //compareTo

    public int compareTo(Word other)
    {
        /*if (word.equals(other))
        {   
            if((word.charAt(0)).toLowerCase() )

        }*/
        return word.length() - other.word.length();
    }


    public String toString()
    {
        return word;

    }

}

如果你能帮助我，那就太好了……

Answer 1

public class MyComparator implements Comparator<String>{
    @Override
    public int compare(String o1, String o2) {  
      if (o1.length() > o2.length()) {
         return 1;
      } else if (o1.length() < o2.length()) {
         return -1;
      }
      return o1.compareTo(o2);
    }
}

然后：

Collections.sort(yourList, new MyComparator());

Answer 2

您的比较方法也应该实现字母顺序：

public int compareTo(Word other)
    {
        int difference = word.length() - other.word.length();
        if(difference == 0){
            return word.compareToIgnoreCase(other.word);
        else{
            return difference;    
        }

    }