Object Serialization
/* From http://java.sun.com/docs/books/tutorial/index.html *//* * Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * -Redistribution of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * -Redistribution in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * Neither the name of Sun Microsystems, Inc. or the names of contributors may * be used to endorse or promote products derived from this software without * specific prior written permission. * * This software is provided "AS IS," without a warranty of any kind. ALL * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN") * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE * AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, * INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY * OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. * * You acknowledge that this software is not designed, licensed or intended * for use in the design, construction, operation or maintenance of any * nuclear facility. */import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.io.Serializable; publicclass CardReader { publicstaticvoid main(String[] args) { Card3 card = new Card3(12, Card3.SPADES); System.out.println("Card to write is: " + card); try { FileOutputStream out = new FileOutputStream("card.out"); ObjectOutputStream oos = new ObjectOutputStream(out); oos.writeObject(card); oos.flush(); } catch (Exception e) { System.out.println("Problem serializing: " + e); } Card3 acard = null; try { FileInputStream in = new FileInputStream("card.out"); ObjectInputStream ois = new ObjectInputStream(in); acard = (Card3) (ois.readObject()); } catch (Exception e) { System.out.println("Problem serializing: " + e); } System.out.println("Card read is: " + acard); } } class Card3 implements Serializable { privateint suit = UNASSIGNED; privateint number = UNASSIGNED; publicfinalstaticint UNASSIGNED = -1; publicfinalstaticint DIAMONDS = 1; publicfinalstaticint CLUBS = 2; publicfinalstaticint HEARTS = 3; publicfinalstaticint SPADES = 4; publicfinalstaticint ACE = 1; publicfinalstaticint KING = 13; public Card3(int number, int suit) { if (isValidNumber(number)) { this.number = number; } else { //Error } if (isValidSuit(suit)) { this.suit = suit; } else { //Error } } publicint getSuit() { return suit; } publicint getNumber() { return number; } publicstaticboolean isValidNumber(int number) { if (number >= ACE && number <= KING) { return true; } else { return false; } } publicstaticboolean isValidSuit(int suit) { if (suit >= DIAMONDS && suit <= SPADES) { return true; } else { return false; } } publicboolean equals(Object obj) { if (obj instanceof Card3) { Card3 card = (Card3) obj; if (card.getNumber() == this.number && card.getSuit() == this.suit) { return true; } else { return false; } } else { return false; } } publicint hashCode() { return number * suit; } public String toString() { return numberToString(this.number) + " of " + suitToString(this.suit); } publicstatic String numberToString(int number) { String result = ""; switch (number) { case ACE: result = "Ace"; break; case 2: result = "Two"; break; case 3: result = "Three"; break; case 4: result = "Four"; break; case 5: result = "Five"; break; case 6: result = "Six"; break; case 7: result = "Seven"; break; case 8: result = "Eight"; break; case 9: result = "Nine"; break; case 10: result = "Ten"; break; case 11: result = "Jack"; break; case 12: result = "Queen"; break; case KING: result = "King"; break; case UNASSIGNED: result = "Invalid Number"; break; } return result; } publicstatic String suitToString(int suit) { String result = ""; switch (suit) { case DIAMONDS: result = "Diamonds"; break; case CLUBS: result = "Clubs"; break; case HEARTS: result = "Hearts"; break; case SPADES: result = "Spades"; break; case UNASSIGNED: result = "Invalid Suit"; break; } return result; } } Related examples in the same category
