基于方法参数创建基于对象的ArrayList

Question

我有一个类与球。

在另一类称为CollectionBalls我有球的集合（什么惊喜）

类CollectionBalls有型球的ArrayList的：

ArrayList <Balls> myBalls; 

什么我想要做的是，当我创建对象CollectionBalls是：在构造函数的参数中设置球的数量。

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); 
    } 
} 

，但我不能动态地创建一个新的球我。

如何根据参数创建对象的数量？

编辑：我可以重新命名我像testBall的东西，但testBall是一个对象，而不是像球10球1球2球3右？

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()); 
    } 
}