有没有办法 println 枚举和列出字符串中的单词？

Question

我正在尝试编写一个 java 程序，该程序将计算声明的句子中的单词数，然后将句子分解为单词，以便列出具有数值的单词并显示单词。我已经解决了总数，但我似乎无法分解句子中的单词然后按时间顺序列出它们。我可以用字符做到这一点，但不能用文字。我已经探索了 Java Cookbook 和其他地方以找到解决方案，但我只是不太了解它。正如我所说，我可以让字符计数，我可以计算单词，但我不能让单个单词在单独的行上打印，并在字符串中使用数值来表示它们的计数。public class MySentenceCounter {    public static void main(String[] args) {        String sentence = "This is my sentence and it is not great";        String[] wordArray = sentence.trim().split("\\s+");        int wordCount = wordArray.length;        for (int i=0; i < sentence.length(  ); i++)            System.out.println("Char " + i + " is " + sentence.charAt(i));         //this produces the character count but I need it to form words, not individual characters.        System.out.println("Total is " + wordCount + " words.");    }}预期结果应如下所示：1 This2 is3 my4 sentence5 and6 it7 is8 not9 greatTotal is 9 words.

Answer 1

迭代wordArray您创建的变量，而不是sentencefor 循环中的原始字符串：

public class MySentenceCounter {

  public static void main(String[] args) {

    String sentence = "This is my sentence and it is not great";

    String[] wordArray = sentence.trim().split("\\s+");

    // String[] wordArray = sentence.split(" "); This would work fine for your example sentence

    int wordCount = wordArray.length;

    for (int i = 0; i < wordCount; i++) {

      int wordNumber = i + 1;

      System.out.println(wordNumber + " " + wordArray[i]);

    }

    System.out.println("Total is " + wordCount + " words.");

  }

}

输出：

1 This

2 is

3 my

4 sentence

5 and

6 it

7 is

8 not

9 great

Total is 9 words.

Answer 2

尽量避免过于复杂，下面的就行了

public class MySentenceCounter {

    public static void main(String[] args) {

        String sentence = "This is my sentence and it is not great";

        int ctr = 0;

        for (String str : sentence.trim().split("\\s+")) {

            System.out.println(++ctr + "" + str) ;

         } 

         System.out.println("Total is " + ctr + " words.");

    }

}

Answer 3

使用 IntStream 而不是 for 循环的更优雅的解决方案：

import java.util.stream.IntStream;

public class ExampleSolution

{

    public static void main(String[] args)

    {

        String sentence = "This is my sentence and it is not great";

        String[] splitted = sentence.split("\\s+");

        IntStream.range(0, splitted.length)

                .mapToObj(i -> (i + 1) + " " + splitted[i])

                .forEach(System.out::println);

        System.out.println("Total is " + splitted.length + " words.");

    }

}