/* * Copyright (c) 2000-2001 Sun Microsystems, Inc. All Rights Reserved. */package examples.addressbook;import java.lang.*;import java.io.*;import java.util.*;import javax.microedition.rms.*;/** * This class provides static methods that allow us * to hide the format of a record. * N.B. no synchronized access is provided */public final class SimpleRecord {    private final static int FIRST_NAME_INDEX = 0;    private final static int LAST_NAME_INDEX = 20;	private final static int FIELD_LEN = 20;    private final static int PHONE_INDEX = 40;    private final static int MAX_REC_LEN = 60;    private static StringBuffer recBuf =        new StringBuffer(MAX_REC_LEN);    // Don't let anyone instantiate this class    private SimpleRecord() {}    // Clear internal buffer    private static void clearBuf() {        for (int i = 0; i < MAX_REC_LEN; i++) {            recBuf.insert(i, ' ');        }        recBuf.setLength(MAX_REC_LEN);    }    /**     * Takes component parts and return a record suitable     * for our address book.     *     *  return  byte[] the newly created record     *  first   record field: first name     *  last    record field: last name     *  num     record field: phone number     */    public static byte[] createRecord(String first,                                      String last,                                      String num) {        clearBuf();        recBuf.insert(FIRST_NAME_INDEX, first);        recBuf.insert(LAST_NAME_INDEX, last);        recBuf.insert(PHONE_INDEX, num);        recBuf.setLength(MAX_REC_LEN);        return recBuf.toString().getBytes();    }    /**     * Extracts the first name field from a record.     *  return  String contains the first name field     *  b       the record to parse     */    public static String getFirstName(byte[] b) {        return new String(b, FIRST_NAME_INDEX, FIELD_LEN).trim();    }    /**     * Extracts the last name field from a record.     *  return  String contains the last name field     *  b       the record to parse     */    public static String getLastName(byte[] b) {        return new String(b, LAST_NAME_INDEX, FIELD_LEN).trim();    }    /**     * Extracts the phone number field from a record.     *  return  String contains the phone number field     *  b       the record to parse     */    public static String getPhoneNum(byte[] b) {        return new String(b, PHONE_INDEX, FIELD_LEN).trim();    }}