ordcount.java

java2参考大全上的例子的源码和自己的理解.

package inputstreamreader;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2005</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */

// A word counting utility.
import java.io.*;

class WordCount {
  public static int words = 0;
  public static int lines = 0;
  public static int chars = 0;

  public static void wc(InputStreamReader isr) throws IOException {
    int c = 0;
    boolean lastWhite = true;
    String whiteSpace = " \t\n\r";

    while ( (c = isr.read()) != -1) {
      // Count characters
      chars++;
      // Count lines
      if (c == '\n') {
        lines++;
      }
      // Count words by detecting the start of a word
      int index = whiteSpace.indexOf(c);
      if (index == -1) {
        if (lastWhite == true) {
          ++words;
        }
        lastWhite = false;
      }
      else {
        lastWhite = true;
      }
    }
    if (chars != 0) {
      ++lines;
    }
  }

  public static void main(String args[]) {
    FileReader fr;
    try {
      if (args.length == 0) { // We're working with stdin
        wc(new InputStreamReader(System.in));
      }
      else { // We're working with a list of files
        for (int i = 0; i < args.length; i++) {

          fr = new FileReader(args[i]);
          wc(fr);
        }
      }
    }
    catch (IOException e) {
      return;
    }
    System.out.println(lines + " " + words + " " + chars);
  }
}