// FileTest.java
// Demonstrates reading and writing files in Java

import java.io.*;

class FileTest {
  public static void main(String[] args) {
    // first, show the contents of file "foo.txt"
    try {
      BufferedReader in = new BufferedReader(new FileReader("foo.txt"));
      String line;
      while ((line = in.readLine()) != null) {
        System.out.println(line);
      }
    }
    catch (FileNotFoundException e) {
      System.out.println("File not found");
    }
    catch (IOException e) {
      System.out.println("IOException: " + e);
    }

  // now, load the contest of the file with something else
  System.out.println("Now loading 5 random lines into the file");
  try {
    FileWriter out = new FileWriter("foo.txt");
    for (int i=0; i<5; i++) {
      String line = "line " + i + ": Random # = " + Math.random();
      System.out.println("output: " + line);
      out.write(line + "\r\n");
    }
    out.close();
  }
  catch (IOException e) {
    System.out.println("IOException: " + e);
  }
  }
}