Java数组变量显示为空？

Question

我正在使用扫描仪用数据填充数组。它似乎有效，因为当我在“if”语句中打印 (player[i].Name) 时，它会打印一个值。但是当我尝试在语句(players[1].Name)之外打印这个值时，它给出了一个空值。

int i = 0;
        while (scanner.hasNextLine()) {
                if (scanner.hasNext()) {
                players[i].Name = scanner.next();
                System.out.println(players[i].Name);
                }
                if (scanner.hasNext()) {
                players[i].Position = scanner.next();
                System.out.println(players[i].Position);
                }
                if (scanner.hasNext()) {
                players[i].Height = scanner.next();
                System.out.println(players[i].Height);
                }
                 if (scanner.hasNext()) {
                players[i].Weight = scanner.next();
                System.out.println(players[i].Weight);
                }
               i++;      
            }//end while

Answer 1

您将执行此操作 10 次(对于每个 i):

 // Get all possible scanner entries for all possible lines for i=0
 while (scanner.hasNextLine()) {
        if (scanner.hasNext()) {
            players[i].Name = scanner.next();
 // .. then repeat getting all scanner entries for all lines for i=1...

也许这就是你的意思:

int i = 0;
while (scanner.hasNextLine()) {
    if (scanner.hasNext()) {
        players[i].Name = scanner.next();
        System.out.println(players[i].Name);
        i++;
    }
}

或者甚至是这样:

int i = 0;
while (scanner.hasNextLine()) {
    while (scanner.hasNext()) {
        players[i].Name = scanner.next();
        System.out.println(players[i].Name);
        i++;
    }
}

或者这个:

int i = 0;
while ((i < 10) && scanner.hasNextLine()) {
    while ((i < 10) && scanner.hasNext()) {
        players[i].Name = scanner.next();
        System.out.println(players[i].Name);
        i++;
    }
}