Question

我有一个带球的课程。

在另一个名为CollectionBalls的类中，我有一组Balls（多么令人惊讶）

类CollectionBalls有一个类型为ball的ArrayList：

 ArrayList <Balls> myBalls;

我想要做的是当我创建对象时，CollectionBalls是：在构造函数的参数中设置球的ammount。

像

public CollectionBalls(int amountOfBalls)
{
    myBalls = new ArrayList <Balls>();
    setAmountOfBalls(amountOfBalls);
}

public void setAmountOfBalls(int amountOBalls)
{
    for (int i = 0; i < amountOBalls;  i ++)
    {
        // Create a new ball
        Ball i = new Ball();
        // Add the ball to the collection of ball
        myBalls.add(i);
    }
}

但我不能用i动态地创造一个新球。

如何根据参数创建对象数量？

编辑：我可以用testBall重命名我，但是testBall是一个对象，而不是10个对象，如球1球2球3对吗？

Answer 1

我看到两个问题

public void setAmountOfBalls(int amountOBalls)
{
  for (int i = 0; i < amountOBalls;  i++)
  {
    // Create a new ball
    // Ball i = new Ball(); // you have a plural class name, but were trying to 
                            // make it singular here and you already have an 
                            // integer variable called i.
    Balls ball = new Balls();
    // Add the ball to the collection of ball
    myBalls.add(ball);
  }
}

Answer 2

public CollectionBalls(int amountOfBalls)
{
    myBalls = new ArrayList <Balls>();
    setAmountOfBalls(amountOfBalls);
}

public void setAmountOfBalls(int amountOBalls)
{
    for (int i = 0; i < amountOf**Registers**;  i ++)

        // Add the ball to the collection of ball
        myBalls.add(new Balls());
    }
}

基于方法参数创建基于对象的ArrayList

2 个答案: