Esempio n. 1
0
  // call this method to write the description to the file
  // the file pointer must be already positioned
  // the description must have been set
  private void writeDescription() throws IOException {
    if (description.length() > DESCRIPTION_LENGTH)
      description = description.substring(0, DESCRIPTION_LENGTH);

    outStream.writeChars(description);
    for (int j = 0; j < (DESCRIPTION_LENGTH - description.length()); j++) outStream.writeChar(' ');
  }
  /**
   * Writes the Item location to the Items Random Access File
   *
   * @param file - the Item's Random Access File
   */
  private void writeLocationToFile(RandomAccessFile file) {
    try {
      file.writeByte(1); // Write the warehouse number
      file.writeByte(getLocation().getAisle()); // Write the aisle number
      file.writeByte(getLocation().getColumn()); // Write the column number
      file.writeChar(getLocation().getRow()); // Write the row number
    } catch (Exception e) {

    }
  }
Esempio n. 3
0
  // call this method to write the column names to the file
  // the file pointer must be already positioned
  private void writeColumnNames(ArrayList names) throws IOException {
    String column;
    for (int i = 0, numCols = names.size(); i < numCols; i++) {
      column = (String) names.get(i);
      if (column.length() > COLUMN_LENGTH) column = column.substring(0, COLUMN_LENGTH);

      outStream.writeChars(column);
      for (int j = 0; j < (COLUMN_LENGTH - column.length()); j++) outStream.writeChar(' ');
    }
  }
Esempio n. 4
0
File: RAF.java Progetto: Utlesh/code
  public static void main(String args[]) {
    try {
      String fname = "d:\\q.txt";
      String mode;
      // mode = "r";//r : file must exist
      mode = "rw"; // rw : file will be created or opened

      // open the file
      RandomAccessFile raf = new RandomAccessFile(fname, mode);

      /*
      //seek and write demo

         raf.seek(10);//position file r/w pointer at index 10 wrt BOF
         //a seek beyond file size causes file to grow upto the seek value
         raf.write(65);//raf.write('A');

      */

      // r/w java datatypes
      int i1, i2;
      float f1, f2;
      char c1, c2;
      String s1, s2;

      i1 = -10;
      f1 = 1234.5678F;
      c1 = 'q';
      s1 = "hello files";

      raf.seek(0); // reach BOF
      raf.writeInt(i1);
      raf.writeFloat(f1);
      raf.writeChar(c1);
      raf.writeUTF(s1);

      raf.seek(0); // reach BOF
      i2 = raf.readInt();
      f2 = raf.readFloat();
      c2 = raf.readChar();
      s2 = raf.readUTF();

      System.out.println(i2);
      System.out.println(f2);
      System.out.println(c2);
      System.out.println(s2);

      // close the file
      raf.close();
    } catch (IOException ex) {
      System.out.println(ex); // ex converts into ex.toString()
    }
  } // main