Copy Binary File Java

import java.io.*;

public class CopyFile{
  private static void copyfile(String srFile, String dtFile){
    try{
      File f1 = new File(srFile);
      File f2 = new File(dtFile);
      InputStream in = new FileInputStream(f1);
      
      //For Append the file.
//      OutputStream out = new FileOutputStream(f2,true);

      //For Overwrite the file.
      OutputStream out = new FileOutputStream(f2);

      byte[] buf = new byte[1024];
      int len;
      while ((len = in.read(buf)) > 0){
        out.write(buf, 0, len);
      }
      in.close();
      out.close();
      System.out.println("File copied.");
    }
    catch(FileNotFoundException ex){
      System.out.println(ex.getMessage() + " in the specified directory.");
      System.exit(0);
    }
    catch(IOException e){
      System.out.println(e.getMessage());      
    }
  }
  public static void main(String[] args){
    switch(args.length){
      case 0: System.out.println("File has not mentioned.");
          System.exit(0);
      case 1: System.out.println("Destination file has not mentioned.");
          System.exit(0);
      case 2: copyfile(args[0],args[1]);
          System.exit(0);
      default : System.out.println("Multiple files are not allow.");
            System.exit(0);
    }
  }
} 

Ref: http://www.roseindia.net/java/beginners/CopyFile.shtml