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[英]On a card view created dynamically, how can I remove individual cards if a delete button specific to a card is pressed?
[英]how can i build a card shuffling method in java for cards to go in a specific order?
卡片必須像上半部和下半部一樣依次排列,直到通過52張卡片組為止。 每個副牌都有26張牌,它們按以下順序排列:
top1, bottom1, top2, bottom2, top3, bottom3, top4, bottom 4, ..., top n, bottom n
我正在考慮這樣做: Card[] topHalf= new Card[cards.length/2];
public void shuffle() {
int index = 0;
for (int suit = 0; suit <= 1; suit++) {
for (int value = 1; value <= 13; value++) {
cards[index] = new Card(value, suit);
index++;
}
}
Card[] botHalf= new Card[(cards.length+26)/2];
int index2 = 0;
for (int suit = 2; suit <= 3; suit++) {
for (int value = 1; value <= 13; value++) {
cards[index] = new Card(value, suit);
index2++;
}
for (int row = 0; row < cards.length; row++){
row++;
Card [] temp = new Card[( topHalf.length)+botHalf.length];
//cards[row]= cards[index];
}
按照卡片顯示順序將其存儲在已排序的地圖中。 Sorted Map將為您進行排序。 然后,您可以依次遍歷它們:
SortedMap map = new SortedMap();
map.put(1, "top1");
map.put(2, "bottom1");
map.put(3, "top2");
...
...
...
Iterator iterator = map.keySet().iterator();
while (iterator.hasNext()) {
Object key = iterator.next();
System.out.println(" card :" + map.get(key));
}
只是為了澄清,聽起來像是您想要的隨機排列數字
1 2 3 4 5 6 7 8
如
1 8 2 7 3 6 4 5
。
最有效的方法是創建一個新數組,因為就地交換元素並不容易,而且不會很快。 此模式中的主要觀察結果是,每個偶數元素(從索引0開始,因此第一個元素為偶數)都從牌組的開始向上計數,奇數元素從牌組的末尾開始向后計數。
使用此信息,我們可以遍歷新數組,根據當前索引是奇數還是偶數,從特定索引中復制原始數組的值。 如果我們新數組中的當前索引稱為i
,則
i
是偶數,那么我們想要的元素位於索引i/2
i
為奇數,則元素位於索引array.length - (i+1)/2
( +1
將舍入為最接近的偶數) 這是代碼:
public static Card[] rifleShuffle(Card[] deck) {
Card[] newDeck = new Card[deck.length];
for (int i = 0; i < newDeck.length; i++) {
// Check whether current index is odd or even by using mod 2
if (i % 2 == 0) {
newDeck[i] = deck[i / 2];
} else {
newDeck[i] = deck[deck.length - ((i + 1) / 2)];
}
}
return newDeck;
}
public static void main(String[] args) {
Card[] deck1 = new Card[52];
int i = 0;
for (int suite = 0; suite < 4; suite++) {
for (int value = 1; value <= 13; value++) {
deck1[i++] = new Card(value, suite);
}
}
System.out.println("Before shuffling: " + Arrays.toString(deck1));
Card[] deck2 = rifleShuffle(deck1);
System.out.println("After shuffling: " + Arrays.toString(deck2));
}
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