用java按字母顺序排列单词

这是我的程序，我不确定它出了什么问题。如果我删除了字母排序的方法，它完全可以正常工作，有人能告诉我这个方法有什么问题以及如何修复它吗。第一部分我应该按单词出现的样子打印，第二部分我应该大写，然后第三部分我应该添加连字符并删除单词之间的空格，最后一部分我应该按字母顺序排列

import static java.lang.System.*;

public class WordFun {

    private String word, loc, changedWord;

    public WordFun() {
    }

    public WordFun(String w) {
        word = w;
        changedWord = w;
    }

    public void setWord(String w) {
    }

    public void makeUpper() {
        changedWord = word.toUpperCase();
    }

    public void addHyphen() {
        String hyphen = word.trim();
        changedWord = word.replaceAll(" ", "-");
    }

    public void alphabetize() {
        int loc;
        loc = original.indexOf(" ");
        String wordOne = original.substring(0, loc);
        String wordTwo = original.substring(loc + 1, word.length());
        if (wordOne.compareTo(wordTwo) > 0) {
            word = wordTwo + " " + wordOne;
        } else {
            word = wordOne + " " + wordTwo;
        }
    }

    public String toString() {
        return changedWord;
    }
}

这是跑步者计划

import static java.lang.System.*;

public class WordFunRunner {

    public static void main(String args[]) {
        WordFun test = new WordFun("Hello World");
        out.println(test);
        test.makeUpper();
        out.println(test);
        test.addHyphen();
        out.println(test);
        test.alphabetize();
        out.println(test);

//add more test cases
        WordFun test1 = new WordFun("Jeroo Bob");
        out.println(test1);
        test1.makeUpper();
        out.println(test1);
        test1.addHyphen();
        out.println(test1);
        test1.alphabetize();
        out.println(test1);

        WordFun test2 = new WordFun("Computer Science");
        out.println(test2);
        test2.makeUpper();
        out.println(test2);
        test2.addHyphen();
        out.println(test2);
        test2.alphabetize();
        out.println(test2);

        WordFun test3 = new WordFun("Golden Bears");
        out.println(test3);
        test3.makeUpper();
        out.println(test3);
        test3.addHyphen();
        out.println(test3);
        test3.alphabetize();
        out.println(test3);

        WordFun test4 = new WordFun("Upper Arlington");
        out.println(test4);
        test4.makeUpper();
        out.println(test4);
        test4.addHyphen();
        out.println(test4);
        test4.alphabetize();
        out.println(test4);
    }
}

---

您的

字母排序（）方法中缺少属性
original

请参阅下面的代码

public void alphabetize() {
    int loc;
    loc = word.indexOf(" ");
    String wordOne = word.substring(0, loc);
    String wordTwo = word.substring(loc + 1, word.length());
    if (wordOne.compareTo(wordTwo) > 0) {
        changedWord = wordTwo + " " + wordOne;
    } else {
        changedWord = wordOne + " " + wordTwo;
    }
}

用
changedWord=
替换
word=
，用
word