Java Is Open Source Programming Language You Can Download From Java and Java Libraries From http://www.oracle.com.
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Use assert the verify value
/*
* Copyright (c) 1995 - 2008 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:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions 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 nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
public class Card {
private final int rank;
private final int suit;
// Kinds of suits
public final static int DIAMONDS = 1;
public final static int CLUBS = 2;
public final static int HEARTS = 3;
public final static int SPADES = 4;
// Kinds of ranks
public final static int ACE = 1;
public final static int DEUCE = 2;
public final static int THREE = 3;
public final static int FOUR = 4;
public final static int FIVE = 5;
public final static int SIX = 6;
public final static int SEVEN = 7;
public final static int EIGHT = 8;
public final static int NINE = 9;
public final static int TEN = 10;
public final static int JACK = 11;
public final static int QUEEN = 12;
public final static int KING = 13;
public Card(int rank, int suit) {
assert isValidRank(rank);
assert isValidSuit(suit);
this.rank = rank;
this.suit = suit;
}
public int getSuit() {
return suit;
}
public int getRank() {
return rank;
}
public static boolean isValidRank(int rank) {
return ACE <= rank && rank <= KING;
}
public static boolean isValidSuit(int suit) {
return DIAMONDS <= suit && suit <= SPADES;
}
public static String rankToString(int rank) {
switch (rank) {
case ACE:
return "Ace";
case DEUCE:
return "Deuce";
case THREE:
return "Three";
case FOUR:
return "Four";
case FIVE:
return "Five";
case SIX:
return "Six";
case SEVEN:
return "Seven";
case EIGHT:
return "Eight";
case NINE:
return "Nine";
case TEN:
return "Ten";
case JACK:
return "Jack";
case QUEEN:
return "Queen";
case KING:
return "King";
default:
// Handle an illegal argument. There are generally two
// ways to handle invalid arguments, throwing an exception
// (see the section on Handling Exceptions) or return null
return null;
}
}
public static String suitToString(int suit) {
switch (suit) {
case DIAMONDS:
return "Diamonds";
case CLUBS:
return "Clubs";
case HEARTS:
return "Hearts";
case SPADES:
return "Spades";
default:
return null;
}
}
public static void main(String[] args) {
// must run program with -ea flag (java -ea ..) to
// use assert statements
assert rankToString(ACE) == "Ace";
assert rankToString(DEUCE) == "Deuce";
assert rankToString(THREE) == "Three";
assert rankToString(FOUR) == "Four";
assert rankToString(FIVE) == "Five";
assert rankToString(SIX) == "Six";
assert rankToString(SEVEN) == "Seven";
assert rankToString(EIGHT) == "Eight";
assert rankToString(NINE) == "Nine";
assert rankToString(TEN) == "Ten";
assert rankToString(JACK) == "Jack";
assert rankToString(QUEEN) == "Queen";
assert rankToString(KING) == "King";
assert suitToString(DIAMONDS) == "Diamonds";
assert suitToString(CLUBS) == "Clubs";
assert suitToString(HEARTS) == "Hearts";
assert suitToString(SPADES) == "Spades";
}
}
