testdatastream.java

Java Classic Examples是我买的两本书：《JAVA经典实例》和《java入门经典源代码》里边附送光盘里带的源码

import java.io.*;
import java.util.Date;

public class TestDataStream
{
  public static void main(String[] args)
  {
    String myStr = new String("Garbage in, garbage out");
    String dirName = "C:/MyData";   // Directory name

    try
    {
      File dir = new File(dirName);  // File object for directory

      if(!dir.exists())              // If directory does not exist
        dir.mkdir();                 // ...create it
      else
        if(!dir.isDirectory())
          {
          System.err.println(dirName + " is not a directory");
          return;
        }

      File aFile = new File(dir, "data.txt"); 
      aFile.createNewFile();         // Now create a new file if necessary

      // Create the byte output stream
      DataOutputStream myStream = new DataOutputStream(
                                    new FileOutputStream(aFile));
      myStream.writeChars(myStr);    // Write the string to the file
    }
    catch(IOException e)
    {
      System.out.println("IO exception thrown: " + e);
    }
  }
}