如何在for循環中循環字符串數組

我想知道我如何做一個for循環做一個for循環，以便根據玩家的數量顯示玩家姓名與擲骰子一起玩的數量用戶。如何在for循環中循環字符串數組

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);

來源

2017-02-18 Johnboy

因爲你的變量'player1'，'player2'等，你不能在for循環中這樣做。但是你可以寫'if（num_of_players> = 1）players [0] = player1;如果（num_of_players> = 2）玩家[1] =玩家2; ...'。 –

如果您爲每個名爲playerN的玩家分別設置了一個變量，那麼您的設計看起來可能存在某些缺陷。顯示更多的代碼來提供一些上下文，並且您會得到更多有用的答案。 – Martin

你的骰子是什麼意思？請詳細說明你需要什麼幫助。 –

不知道循環是適用在這裏，但這種簡化是可能的，因爲每塊重複以前的工作......

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; 
}

解決這個將要創建的另一種方式數組並將其用於循環。更好的是player1，player2變量將是一個數組。

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

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

來源

2017-02-18 12:51:52 Adam

既然你已經有了6個player變量，你可以把這些放到一個數組，然後採取的陣列的一部分的副本。有無需顯式循環：

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

請注意，您只設置的players第一num_of_players元素，你將有null元素末（或任何恰好是這些元素的話）; for循環仍然會遍歷這些元素。

如果這不是你想要的，你可能要考慮將較小的列表players：

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

或者你可以在列表中包裹的陣列，並採取子表：

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

來源

2017-02-18 12:54:18

如何在for循環中循環字符串數組

回答

相關問題