将对象实例分配给数组答案

【问题标题】：Assigning instances of objects to an array将对象实例分配给数组
【发布时间】：2015-07-15 09:12:08
【问题描述】：

我正在使用bufferedFileReader 和lineScanner 读取csv 文件，以逗号分隔并将行中的第一个标记分配给Team 类的对象。在此之后的每个标记都分配给Team 的变量。

这部分工作正常。下一部分是将这些对象放入一个数组中，我不知道该怎么做。我假设我需要在 while 循环（可能是 for 循环）的底部放置更多代码，但我不确定。

类的代码是：

public class Pool
{
   /* instance variables */
   private String poolName; // the name of the pool
   private Team[] teams;    // the teams in the pool
   private final static int NOOFTEAMS = 5; // number of teams in each pool

   /**
    * Constructor for objects of class Pool
    */
   public Pool(String aName)
   {
      super();
      this.poolName = aName;
      this.teams = new Team[NOOFTEAMS];
   }

  /**
    * Prompts the user for the name of the text file that 
    * contains the results of the teams in this pool. The
    * method uses this file to set the results of the teams.
    */
   public void loadTeams()
   {
      String fileName;
      OUDialog.alert("Select input file for " + this.getPoolName());
      fileName = OUFileChooser.getFilename();
      File aFile = new File(fileName);
      BufferedReader bufferedFileReader = null;

      try
      {
         Scanner lineScanner;
         bufferedFileReader = new BufferedReader(new FileReader(aFile));
         String correctPool = bufferedFileReader.readLine();

         if (!poolName.equals(correctPool))
         {
           OUDialog.alert("Wrong File Selected");           
         }
         else
         {
            String currentLine = bufferedFileReader.readLine();
            while (currentLine != null)
            {
               lineScanner = new Scanner(currentLine); 
               lineScanner.useDelimiter(",");
               Team aTeam = new Team(lineScanner.next());
               aTeam.setWon(lineScanner.nextInt());
               aTeam.setDrawn(lineScanner.nextInt());
               aTeam.setLost(lineScanner.nextInt());
               aTeam.setFourOrMoreTries(lineScanner.nextInt());
               aTeam.setSevenPointsOrLess(lineScanner.nextInt());
               currentLine = bufferedFileReader.readLine();
               aTeam.setTotalPoints(aTeam.calculateTotalPoints());
               //somewhere here I need to add the aTeam object to the array

             }
      }

【问题讨论】：

teams[someCounter++] = aTeam;?
如果Pool 没有扩展任何东西，super() 会做什么？
@moarCoffee 除了Object，一切都扩展了一些东西。所以它像正常一样调用父构造函数
@Jyr 类似于 'List = new ArrayList();'在 while 循环之前，然后是 'ArrayListName.add(aTeam);?'在while循环结束时？
将变量 (someCounter) 初始化为 0 并按照 @DaveNewton 的建议进行操作。

标签： java arrays bufferedreader java-io

【解决方案1】：

public class Pool
{  
    private int teamCounter;
    ...

    public Pool(String aName)
    {
        super();
        this.poolName = aName;
        this.teams = new Team[NOOFTEAMS];
        teamCounter=0;
    }

    ...

    public void loadTeams()
    {
        ...
        //somewhere here I need to add the aTeam object to the array
        this.teams[teamCounter++]=aTeam;

    }
}

【讨论】：

teamCounter 需要在loadTeams() 中初始化，而不是在构造函数中。

【解决方案2】：

将此添加到您的属性中：

private List<Team> myTeam=new ArrayList<Team>();

然后在你的循环中在最后添加这一行：

myTeam.add(aTeam);

如果绝对必须是array 而不是ArrayList，那么在循环之后执行此操作：

Team[] myArray=new Team[myTeam.size()];
myTeam.toArray(myArray);

【讨论】：