Question

for (int i = 0; i <= numOfPlayers; i++)
{    
   System.out.println("What is your name? ");
   String name = scan.next();
   System.out.println("Choose a color (Red, blue, green, yellow)");
   String color = scan.next();
   int id = players.add(new Player(name, id, color));
}

我试图这样做，id号等于一个递增的数字，每增加一个新玩家就会增加。我怎么能这样做？

Answer 1

您可以使用i变量：

for (int i = 0; i <= numOfPlayers; i++) {
    System.out.println("What is your name? ");
    String name = scan.next();
    System.out.println("Choose a color (Red, blue, green, yellow)");
    String color = scan.next();
    int id = i;
    players.add(new Player(name, id, color));
}

Answer 2

for (int i = 0; i <= numOfPlayers; i++) {
    System.out.println("What is your name? ");
    String name = scan.next();
    System.out.println("Choose a color (Red, blue, green, yellow)");
    String color = scan.next();
    int id = i+1;
    players.add(new Player(name, id, color));
}

make i + 1，而我的问题将被解决..

Answer 3

int id = 0; // If you persist the IDs in DB, replace with a function to get the latest id
for (int i = 0; i <= numOfPlayers; i++) {
    System.out.println("What is your name? ");
    String name = scan.next();
    System.out.println("Choose a color (Red, blue, green, yellow)");
    String color = scan.next();
    id++;
    players.add(new Player(name, id, color));
// Using variable i like sayd @Patrícia Espada
for (int i = 0; i <= numOfPlayers; i++) {
    System.out.println("What is your name? ");
    String name = scan.next();
    System.out.println("Choose a color (Red, blue, green, yellow)");
    String color = scan.next();
    players.add(new Player(name, (i+1), color));

Answer 4

您可能需要考虑更改此行：

int id = players.add(new Player(name, id, color));

到这些：

int id = i; // assigning value of "i", that is incremented in each loop, to "id"
players.add(new Player(name, id, color)); // adding new Player to players list using incremented value of "id"

你也可以写一行而不是我写的两行：

players.add(new Player(name, i + 1, color))

因为在此循环中创建int id似乎完全是多余的。

如何在循环中创建增量器整数值

4 个答案: