java - 计算 StdIn 中的行数和字符数

Question

我想在运行此代码时将一些内容放入 StdIn 中，例如一行文本。该代码应打印出文本字符串中的行数、字符数和单词数。我目前能够计算出字符和单词的数量，但在查找行数时遇到困难。我如何在这里实现它？

public class WordCount
{
    public static void main(String [] args){
        int words = 0, lines = 0, characters = 0;
        while (!StdIn.isEmpty()) {
            String word = StdIn.readString();
            characters += word.length();
            words++;
        }
        StdOut.println("There are " + words + "words");
        StdOut.println("There are " + characters + "characters");
    }
}

Answer 1

来自doc ，您可以使用方法 readLine() 而不是 readString()。这样您就可以轻松获得行数。得到该行后，您可以将其按空格分割并计算单词数。循环遍历每个单词以获得字符数。

public class WordCount
{
    public static void main(String [] args){
        int words = 0, lines = 0, characters = 0;
        while (!StdIn.isEmpty()) {
            String line = StdIn.readLine();
            lines++;
            String[] lineWords = line.split("\\s+");
            words += lineWords.length;
            for(String word : lineWords)
                characters += word.length();
        }
        StdOut.println("There are " + lines + "lines");
        StdOut.println("There are " + words + "words");
        StdOut.println("There are " + characters + "characters");
    }
}