我必须制作一张牌，另一类牌。我的甲板课需要我的卡类。在我的甲板课上，我必须使用与main相同的方法构建甲板，我做了。然后我还必须以与main相同的方法打印卡座。这是我的问题：我尝试使用典型的toString方法，它在main中工作正常。但我在使用自己的方法打印时却遇到了麻烦。谁能告诉我在我的打印方法中我做错了什么？任何帮助表示赞赏！
卡类：
public class card
{
private int face;
private String suit;
public card()
{
face = 0;
String suit = " ";
}
public card(int face, String suit)
{
setFace(face);
setSuit(suit);
}
public void setFace(int f)
{
if(f >= 1 && f <= 10)
face = f;
else
face = 1;
}
public int getFace()
{
return face;
}
public void setSuit(String s)
{
if( s == "Hearts" && s == "Clubs" && s == "Diamonds" && s == "Ace")
suit = s;
else
suit = "Hearts";
}
public String getColor()
{
return suit;
}
}
甲板课程：
import java.util.*;
public class DeckOfCards
{
public static void main(String[] arg)
{
card myCard = new card();
card deck[] = new card[52];
//System.out.println(Arrays.toString(deck));
buildDeck(deck);
System.out.print(myCard);
}
// method builds deck
public static void buildDeck(card[] cardList)
{
cardList[0] = new card(1, "Hearts");
cardList[1] = new card(2, "Hearts");
cardList[2] = new card(3, "Hearts");
cardList[3] = new card(4, "Hearts");
cardList[4] = new card(5, "Hearts");
cardList[5] = new card(6, "Hearts");
cardList[6] = new card(7, "Hearts");
cardList[7] = new card(8, "Hearts");
cardList[8] = new card(9, "Hearts");
cardList[9] = new card(10, "Hearts");
cardList[10] = new card(11, "Hearts");
cardList[11] = new card(12, "Hearts");
cardList[12] = new card(13, "Hearts");
cardList[13] = new card(1, "Clubs");
cardList[14] = new card(2, "Clubs");
cardList[15] = new card(3, "Clubs");
cardList[16] = new card(4, "Clubs");
cardList[17] = new card(5, "Clubs");
cardList[18] = new card(6, "Clubs");
cardList[19] = new card(7, "Clubs");
cardList[20] = new card(8, "Clubs");
cardList[21] = new card(9, "Clubs");
cardList[22] = new card(10, "Clubs");
cardList[23] = new card(11, "Clubs");
cardList[24] = new card(12, "Clubs");
cardList[25] = new card(13, "Clubs");
cardList[26] = new card(1, "Diamonds");
cardList[27] = new card(2, "Diamonds");
cardList[28] = new card(3, "Diamonds");
cardList[29] = new card(4, "Diamonds");
cardList[30] = new card(5, "Diamonds");
cardList[31] = new card(6, "Diamonds");
cardList[32] = new card(7, "Diamonds");
cardList[33] = new card(8, "Diamonds");
cardList[34] = new card(9, "Diamonds");
cardList[35] = new card(10, "Diamonds");
cardList[36] = new card(11, "Diamonds");
cardList[37] = new card(12, "Diamonds");
cardList[38] = new card(13, "Diamonds");
cardList[39] = new card(1, "Diamonds");
cardList[40] = new card(2, "Diamonds");
cardList[41] = new card(3, "Diamonds");
cardList[42] = new card(4, "Diamonds");
cardList[43] = new card(5, "Diamonds");
cardList[44] = new card(6, "Diamonds");
cardList[45] = new card(7, "Diamonds");
cardList[46] = new card(8, "Diamonds");
cardList[47] = new card(9, "Diamonds");
cardList[48] = new card(10, "Diamonds");
cardList[49] = new card(11, "Diamonds");
cardList[50] = new card(12, "Diamonds");
cardList[51] = new card(13, "Diamonds");
}
// method to print deck
public String toString()
{
System.out.println(Arrays.toString(deck));
}
}
答案 0 :(得分：1)
你的toString方法应该返回一个String，而不是打印它。
所以，替换这个：
public String toString(){
System.out.println(Arrays.toString(deck));
}
通过以下方式：
public String toString(){
return Arrays.toString(deck);
}
答案 1 :(得分：1)
您的deck[]被定义为main方法中的局部变量。您需要将其移出并使其成为静态类级变量。
此外，您可能不应该调用您的打印方法toString()。 toString是Object上的现有方法，您正在此处进行投影。
答案 2 :(得分：0)
我个人会做这样的事情：
public class Cards {
public static void main(String[] args) {
DeckOfCards deck = new DeckOfCards();
System.out.println( deck );
}
}
public class CardSuit {
public static final CardSuit CLUBS = new CardSuit("Clubs");
public static final CardSuit DIAMONDS = new CardSuit("Diamonds");
public static final CardSuit HEARTS = new CardSuit("Hearts");
public static final CardSuit SPADES = new CardSuit("Spades");
private String suit;
private CardSuit( String suit ){
this.suit = suit;
}
@Override public String toString(){ return this.suit; }
}
public class CardFace {
private String face;
public CardFace( int value ){
this.face = this.convertValueToFace( value );
}
private String convertValueToFace( int value ){
if ( value > 1 && value < 11 ){
return Integer.toString( value );
}
switch( value ){
case 11 : { return "J"; }
case 12 : { return "Q"; }
case 13 : { return "K"; }
case 1 : { return "A"; }
}
throw new IllegalArgumentException(
"Card face value must be between 1 and 13"
);
}
@Override public String toString(){ return this.face; }
}
public class Card {
private CardSuit suit;
private CardFace face;
public Card( CardSuit suit, CardFace face ){
this.suit = suit;
this.face = face;
}
@Override public String toString(){
return this.face + " of " + this.suit;
}
}
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
public class DeckOfCards {
private List<Card> cards;
public DeckOfCards(){
this.createDeck();
}
private void createDeck(){
this.cards = new ArrayList<Card>();
List<CardSuit> suits = new ArrayList<CardSuit>();
suits.add( CardSuit.HEARTS );
suits.add( CardSuit.DIAMONDS );
suits.add( CardSuit.CLUBS );
suits.add( CardSuit.SPADES );
List<CardFace> faces = new ArrayList<CardFace>();
int valueStart = 1;
int valueEnd = 13;
for ( int value = valueStart; value <= valueEnd; value++ ){
faces.add( new CardFace( value ) );
}
Iterator<CardSuit> suitIterator = suits.iterator();
while( suitIterator.hasNext() ){
CardSuit suit = suitIterator.next();
Iterator<CardFace> faceIterator = faces.iterator();
while( faceIterator.hasNext() ){
Card card = new Card( suit, faceIterator.next() );
this.cards.add( card );
}
}
}
@Override public String toString(){
String result = "Card Deck: [\n";
Iterator<Card> cardIterator = this.cards.iterator();
while( cardIterator.hasNext() ){
result += "\t" + cardIterator.next().toString() + "\n";
}
result += "]";
return result;
}
}