小编lil*_*ili的帖子

public class App1 
{

 public static void main(String[] args) 
 {
   Point point_1 = new Point(5,5);
   Point point_2 = new Point(7,8);
   Circle circle_1 = new Circle(point_2, 10);
   point_1 = null;
   point_2 = null;
 }
}

执行此代码后存在多少个对象引用？为什么？