无法添加到ArrayList

Question

Been trying to add an object (coordinates of a missile) to ArrayList, but it only adds the last one. There's only one object in ArrayList.

Missile class

   public ArrayList<Missilies> missilies = new ArrayList<Missilies>();

  //  New missile object  ////////

 public Missilies(int x, int y){

    // missilies = new ArrayList<Missilies>();
    this.x=x;
    this.y=y;

     visible=true;

 }

   public  void fire(){


    System.out.println("Fire !!!");

        missilies.add(new Missilies(x,y));
        System.out.println(" New missile added, total="+
                    +missilies.size()+"  missile    "+missilies);
 }

Player class. Now it works.

 @Override
public void keyPressed(KeyEvent e) {
    switch (e.getKeyCode()){
    case KeyEvent.VK_SPACE:{

        if (lastKey == null || lastKey != e.getKeyChar()) {
            lastKey = e.getKeyChar();
            Missilies m = new Missilies(x,y);
            m.fire();
            missilies.add(m);
           System.out.println("Missilies "+missilies);


            System.out.println("keyPressed: " + lastKey);
        }

Answer 1

By having the list of missiles inside the Missilies class, you make each missile have its own list - and the missile itself is the only thing on its list. You need to move the declaration of the list to a different class.

Answer 2

尝试将射击方法或列表声明移至Missile类之外，您将在列表中填充所有导弹对象