计数文件中的字符,字和行 [英] count characters, words and lines in file
本文介绍了计数文件中的字符,字和行的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
这应该计算行,字和字符的数量到文件中。
This should count number of lines, words and characters into file.
但它不工作。从输出中只显示 0
。
But it doesn't work. From output it shows only 0
.
代码:
$ b
Code:
public static void main(String[] args) throws IOException {
int ch;
boolean prev = true;
//counters
int charsCount = 0;
int wordsCount = 0;
int linesCount = 0;
Scanner in = null;
File selectedFile = null;
JFileChooser chooser = new JFileChooser();
// choose file
if (chooser.showOpenDialog(null) == JFileChooser.APPROVE_OPTION) {
selectedFile = chooser.getSelectedFile();
in = new Scanner(selectedFile);
}
// count the characters of the file till the end
while(in.hasNext()) {
ch = in.next().charAt(0);
if (ch != ' ') ++charsCount;
if (!prev && ch == ' ') ++wordsCount;
// don't count if previous char is space
if (ch == ' ')
prev = true;
else
prev = false;
if (ch == '\n') ++linesCount;
}
//display the count of characters, words, and lines
charsCount -= linesCount * 2;
wordsCount += linesCount;
System.out.println("# of chars: " + charsCount);
System.out.println("# of words: " + wordsCount);
System.out.println("# of lines: " + linesCount);
in.close();
}
我不明白发生了什么。
任何建议?
I can't understand what's going on. Any suggestions?
推荐答案
使用字符串查找行,字和字符计数:
Different approach. Using strings to find line,word and character counts:
public static void main(String[] args) throws IOException {
//counters
int charsCount = 0;
int wordsCount = 0;
int linesCount = 0;
Scanner in = null;
File selectedFile = null;
JFileChooser chooser = new JFileChooser();
// choose file
if (chooser.showOpenDialog(null) == JFileChooser.APPROVE_OPTION) {
selectedFile = chooser.getSelectedFile();
in = new Scanner(selectedFile);
}
while (in.hasNext()) {
String tmpStr = in.nextLine();
if (!tmpStr.equalsIgnoreCase("")) {
String replaceAll = tmpStr.replaceAll("\\s+", "");
charsCount += replaceAll.length();
wordsCount += tmpStr.split(" ").length;
}
++linesCount;
}
//display the count of characters, words, and lines
System.out.println("# of chars: " + charsCount);
System.out.println("# of words: " + wordsCount);
System.out.println("# of lines: " + linesCount);
in.close();
}
注意
对于其他编码风格,请使用
new Scanner(new File(selectedFile),###); new Scanner(selectedFile);
。
Note:
For other encoding styles use
new Scanner(new File(selectedFile), "###");
in place of new Scanner(selectedFile);
.
###
is the Character set to needed. Refer this and wiki
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