Source Code : Object Serialization

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Object Serialization

      
/* From http://java.sun.com/docs/books/tutorial/index.html */

/*
 * Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
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 * modification, are permitted provided that the following conditions are met:
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 *  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
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import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

public class CardReader {
  public static void 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 {
  private int suit = UNASSIGNED;

  private int number = UNASSIGNED;

  public final static int UNASSIGNED = -1;

  public final static int DIAMONDS = 1;

  public final static int CLUBS = 2;

  public final static int HEARTS = 3;

  public final static int SPADES = 4;

  public final static int ACE = 1;

  public final static int KING = 13;

  public Card3(int number, int suit) {
    if (isValidNumber(number)) {
      this.number = number;
    } else {
      //Error
    }

    if (isValidSuit(suit)) {
      this.suit = suit;
    } else {
      //Error
    }
  }

  public int getSuit() {
    return suit;
  }

  public int getNumber() {
    return number;
  }

  public static boolean isValidNumber(int number) {
    if (number >= ACE && number <= KING) {
      return true;
    } else {
      return false;
    }
  }

  public static boolean isValidSuit(int suit) {
    if (suit >= DIAMONDS && suit <= SPADES) {
      return true;
    } else {
      return false;
    }
  }

  public boolean 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;
    }
  }

  public int hashCode() {
    return number * suit;
  }

  public String toString() {
    return numberToString(this.number) + " of " + suitToString(this.suit);
  }

  public static 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;
  }

  public static 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;
  }
}
           
         
    
    
    
    
    
  

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