树集未添加所有对象

Question

我正在为越南语写字典，但我的 Treeset 只添加了 1 个对象。我一直在寻找 2 天，但我无法弄清楚如何。希望你们帮助我。public class Word implements Comparable<Word> {private static String word_target, word_explain;public static void setWord_target(String word_target) {    Word.word_target = word_target;}public static void setWord_explain(String word_explain) {    Word.word_explain = word_explain;}public String getWord_explain() {    return word_explain;}public String getWord_target() {    return word_target;}@Overridepublic int compareTo(Word word) {    return this.getWord_target().compareTo(word.getWord_target());}}public class Dictionary {private TreeSet<Word> words = new TreeSet<Word>();public TreeSet<Word> getWords() {    return words;}}public class DictionaryManagement {static Scanner reader = new Scanner(System.in);public static int numbers;public static void insertFromCommandline(Dictionary dic) {    numbers = reader.nextInt();    reader.nextLine();    for (int i = 0; i < numbers; i++) {        Word putInWord = new Word();        String en_word, vn_word;        System.out.print("English Word: ");        en_word = reader.nextLine();        putInWord.setWord_target(en_word);        System.out.print("VietNameses Word: ");        vn_word = reader.nextLine();        putInWord.setWord_explain(vn_word);        dic.getWords().add(putInWord);    }}}public class DictionaryCommandline {private static int num = 1;public static Dictionary showWord = new Dictionary();public static void showAllWords() {    System.out.println("No      |English            |Vietnamese");    for (Word wr : showWord.getWords()) {        System.out.println( num++ + "       |" + wr.getWord_target() + "             |" +  wr.getWord_explain());    }}例子：输入：2英文单词：房子越南语词：义芽英文单词：姓名越南语词：十- 实际输出：没有英语越南1名十- 预期输出：没有英语越南1 房子 ngoi nha2名十