使用StringTokenizer计算单词和单词中的字符数量

Question

目标是从用户那里获得一个句子输入，对其进行标记，然后只给出关于前三个单词的信息(单词本身、长度，然后计算前三个单词长度的平均值)。我不确定如何将令牌转换为字符串。我只是需要一些指导-不知道如何进行。到目前为止我已经明白了:

public static void main(String[] args) {
    String delim = " ";
    String inSentence = JOptionPane.showInputDialog("Please enter a sentence of three or more words: ");
    StringTokenizer tk = new StringTokenizer(inSentence, delim);
    int sentenceCount = tk.countTokens();

    // Output
    String out = "";
    out = out + "Total number of words in the sentence: " +sentenceCount +"n";
    JOptionPane.showMessageDialog(null, out);

}

我真的很感激任何指导!

Answer 1

如果您只想获得前3个标记，那么您可以这样做:

String first = tk.nextToken();
String second = tk.hasMoreTokens() ? tk.nextToken() : "";
String third = tk.hasMoreTokens() ? tk.nextToken() : "";

从那里应该很容易计算其他需求

Answer 2

public static void main(String[] args) {
    String delim = " ";
    String inSentence = JOptionPane.showInputDialog("Please enter a sentence of three or more words: ");
    StringTokenizer tk = new StringTokenizer(inSentence, delim);
    int sentenceCount = tk.countTokens();
    // Output
    String out = "";
    out = out + "Total number of words in the sentence: " +sentenceCount +"n";
    JOptionPane.showMessageDialog(null, out);
    int totalLength = 0;
    while(tk.hasMoreTokens()){
        String token = tk.nextToken();
        totalLength+= token.length();
        out = "Word: " + token + " Length:" + token.length();
        JOptionPane.showMessageDialog(null, out);
    }
    out = "Average word Length = " + (totalLength/3);
    JOptionPane.showMessageDialog(null, out);
}

Answer 3

使用nextToken()获取单个字符串的方法。

while (tk.hasMoreTokens()) {
  System.out.println(st.nextToken());
}

当然，除了打印它们之外，您可以自由地做任何其他事情。如果您只想要前三个令牌，则可能不希望使用while循环，而是使用几个简单的if语句。