求助大神java类的继承问题，什么叫入口主类?

求助大神java类的继承问题，什么叫入口主类?

就是包含有public static void main(String []args)的类追问那能问您一下类名常量字段是什么样的，方便举个例子吗追答“类名常量字段”，没有这个说法追问那这个类名能怎么写，想问您一下这题的思路，我刚学java没多久，思路有点不清晰追答思路就是按照题目要求做就可以了
题目说的很明确，实现一个Animal类，有私有成员message，和常量className
有五个方法：
public Animal()
public void setMessage()
public String getMessage()
public void breath()
public void move()
再实现Bird Horse Fish均继承Animal，都重载move方法。追问还能问您下循环输入的问题吗，我基本都能运行，但不能循环输入
System.out.println("构造一个鸟对象");
Animals a = new Bird();
a.breath();
a.move();

}
else if(num==2)

9999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999998999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999

看到8了我告诉你