Question

Here i m declaring an instance of class animal in the same class. In c It is considered an error:

struct demo{
        int anyvar;
        struct demo anyvar1;
};

因为它应该是无限的宣言。

然后, 为什么在 Java允许使用这一法典?

class Animal{
    Animal object1 = new Animal();

    public static void main(String[] args)
    {     
            Animal obj = new Animal();
            obj.dostuff();
    }

    public void dostuff()
    {
           System.out.println("Compiles");
           object1.dostuff();
    }

    public void keepdoingstuff()
    {
             System.out.println("Doing Stuff...");

             object1.keepdoingstuff();
    }
}

Answer 1

因为在 Java,你重新宣布一个包含参比值>的变量;点名。

它喜欢这样做:

struct demo{

    int anyvar;
    struct demo *anyvar1;
};

java的所有物体均在斜坡上制造,并用<条码>新关键词明确制造。

public class Node
{
   Node next;
   String value;

   public Node() { ... }

   ...
}

next and value are automatically initialized to null when a Node object is instantiated and will remain so until a reference value is assigned to them.

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