java - 数组返回空值

Question

我对数组有点困惑，希望有人能帮助我。

我希望这是有道理的，因为我有点困惑。非常感谢任何帮助!

在“League”类中创建对象的 while 循环

     while (lineScanner.hasNextLine())
       {
       currentLine = lineScanner.nextLine();
           String[] newSSs = currentLine.split(","); 
           Team team = new Team(newSS[0]);
           team.setWins(Integer.valueOf(newSS[1]));
           team.setDraws(Integer.valueOf(newSS[2]));
           team.setLoses(Integer.valueOf(newSS[3]));
           team.setPoints(team.calculatePoints());

Answer 1

我想我知道你想做什么...... 在 while 循环之前创建一个 ArrayList(您需要某种类型的集合来存储已解析的团队):

private ArrayList<Team> teams = new ArrayList<Team>();

while (lineScanner.hasNextLine()){
    currentLine = lineScanner.nextLine();
    String[] newSSs = currentLine.split(","); 
    Team team = new Team(newSS[0]);
    team.setWins(Integer.valueOf(newSS[1]));
    team.setDraws(Integer.valueOf(newSS[2]));
    team.setLoses(Integer.valueOf(newSS[3]));
    team.setPoints(team.calculatePoints());
}

你实际上只有一个数组 - 保存团队的数组。 newSS 的生命周期仅限于一次循环，一旦 lineScanner 没有更多行要处理，循环就会结束，newSS 会被丢弃。

希望对你有帮助