如何在for循环中循环字符串数组

Question

我想知道如何执行for循环来执行for循环，以便根据用户输入的玩家数量在骰子的旁边显示玩家的名字。

if (num_of_players == 1) {
    players[0] = player1;
}
if (num_of_players == 2) {
    players[0] = player1;
    players[1] = player2;
}
if (num_of_players == 3) {
    players[0] = player1;
    players[1] = player2;
    players[2] = player3;
}
if (num_of_players == 4) {
    players[0] = player1;
    players[1] = player2;
    players[2] = player3;
    players[3] = player4;
}
if (num_of_players == 5) {
    players[0] = player1;
    players[1] = player2;
    players[2] = player3;
    players[3] = player4;
    players[4] = player5;
}
if (num_of_players == 6) {
    players[0] = player1;
    players[1] = player2;
    players[2] = player3;
    players[3] = player4;
    players[4] = player5;
    players[5] = player6;
}

for (String y : players) {
    JOptionPane.showMessageDialog(null, "The first dice rolls " + y);

Answer 1

由于您已经有6个player变量，您可以将它们放入数组中，然后复制数组的一部分。 不需要显式循环：

String[] aPlayers = {player1, player2, player3, player4, player5, player6};
System.arraycopy(aPlayers, 0, players, 0, num_of_players);

---

请注意，您只设置第一num_of_players元素players ，您将有null元素末（或任何恰好是这些元素的话）; 并且for循环仍会遍历这些元素。

如果这不是您想要的，则可能需要考虑为players分配一个较小的列表：

players = Arrays.copyOfRange(aPlayers, 0, num_of_players);

或者，您可以将数组包装在列表中并获取一个子列表：

for (String y : Arrays.asList(players).subList(0, num_of_players)) {

Answer 2

不确定循环是否适用于此，但由于每个块都重复了先前的工作，因此这种简化是可能的...

if (num_of_players == 1) {
    players[0] = player1;
}
if (num_of_players >= 2) {
    players[1] = player2;
}
if (num_of_players >= 3) {
    players[2] = player3;
}
if (num_of_players >= 4) {
    players[3] = player4;
}
if (num_of_players >= 5) {
    players[4] = player5;
}
if (num_of_players >= 6) {
    players[5] = player6;
}

解决此问题的另一种方法是创建一个数组并将其与循环一起使用。 更好的是player1，player2变量将是一个数组。

String [] playersArray = {player1, player2, player3, player4, player5, player6};

for (int i = 0; i< num_of_players; i++) {
    players[i] = playersArray[i];
}