Question

该程序旨在告诉我文件中有多少单词，但它给了我很高的数字。暗示它正在读取字符数而不是单词，或者是单独的逻辑错误。

package wordinspection;

import java.io.*;
import java.util.*;

public class WordInspection {
private Scanner reader;
private File file;

public WordInspection(File file) {
    this.file = file;
}

public int wordCount() {
  String words = readFile();
    System.out.println(words);
    words.split("\\s+");
  return words.length();
}

public String readFile() {
    try {
        String str = "";

        Scanner reader = new Scanner(file, "UTf-8");

        while (reader.hasNextLine()) {
            str += reader.nextLine();
            str += "\n";
        }

        return str;
    } catch (FileNotFoundException e) {

        System.out.println("Does nothing");
        return "";

    }

}

Answer 1

words.split("\\s+");不会修改words;它只返回一个新数组。您忽略了返回值并在原始字符串上调用length()。将其更改为：

return words.split("\\s+").length;

Answer 2

string.split()返回一个字符串数组（http://docs.oracle.com/javase/8/docs/api/java/lang/String.html#split-java.lang.String-）

public int wordCount() {
   String str = readFile();
   System.out.println(str);
   String[] words = str.split("\\s+");
   return words.length;
}

计算返回字符数而不是单词的单词

2 个答案: