这是代码:
基本上,这个代码打印出52张西装+等级的牌.
package javaapplication52;
public class JavaApplication52 {
public static void deck() {
String[] suit = { "Clubs", "Diamonds", "Hearts", "Spades" };
String[] rank = { "2", "3", "4", "5", "6", "7", "8", "9", "10", "Jack",
"Queen", "King", "Ace" };
// avoid hardwired constants
int SUITS = suit.length;
int RANKS = rank.length;
int N = SUITS * RANKS;
// initialize deck
String[] deck = new String[N];
for (int i = 0; i < RANKS; i++) {
for (int j = 0; j < SUITS; j++) {
deck[SUITS * i + j] = rank[i] + " of " + suit[j];
}
}
// shuffle
for (int i = 0; i < N; i++) {
int r = i + (int) (Math.random() * (N - i));
String t = deck[r];
deck[r] = deck[i];
deck[i] = t;
}
// print shuffled deck
for (int i = 0; i < N; i++) {
System.out.println(deck[i]);
}
}
public static void main(String[] arg) {
JavaApplication52 d = new JavaApplication52();
d.deck();
}
}
对我没用的代码
deck[SUITS * i + j] = rank[i] + " of " + suit[j]
我没有说的是,为什么他们乘以SUITS乘以我然后加上j.令人困惑的是SUITS(等于4),乘以i(13),然后加上j(其值为4),根本不等于52.所以请解释一下,这个函数是如何工作的.