formattester.java

Java5.0 Tiger 程序员高手秘笈一书的源代码

package com.oreilly.tiger.ch09;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;

public class FormatTester {

  public static void main(String[] args) {
    String filename = args[0];

    try {
      File file = new File(filename);
      FileReader fileReader = new FileReader(file);
      BufferedReader reader = new BufferedReader(fileReader);
   
      String line;
      int i = 1;
      while ((line = reader.readLine()) != null) {
        System.out.printf("Line %d: %s%n", i++, line);
      }

    } catch (Exception e) {
      System.err.printf("Unable to open file named '%s': %s", 
                        filename, e.getMessage());
    }
  }
}