我想用drjava学习java。
当我尝试运行这段代码时，drjava告诉我：
静态错误：此类没有接受字符串[]的静态void main方法。
我不明白的是为什么drjava告诉我没有main。这是班级犬类申报后的第一行；我没有看到任何拼写错误或缺少标点符号。
我试着用谷歌搜索这个，但我不明白他们在说什么。
如果有人能给我一个线索，虽然不能给我答案，但却能让我自己弄清楚为什么会发生这种事，那就太好了——但是如果问题太简单，无法创造学习机会，那么我会采取解决办法；我想是吧。

/*
 * This is an exercise designed to practice creating a class Animal
 * And then creating another class canine in which to create an object dog.
 * The reason I want to call from one class to another is because I want 
 * to understand how classes, objects, inheritance, etc. works. 
 * Clearly, class canine is -in my mind at least, a child of class Animal.
 * The main method of canine then calls method attributes I think are being
 * inherited by dog and wolf,from the class Animal.    
 */

public class Animal {
  void growl() {
    System.out.println("Grrr");
  }
  void bark() {
    System.out.println("Arf! Arf!");
  }
}

class canine {
  public static void main(String[]args) {
    Animal dog = new Animal();
    dog.bark();

    Animal wolf = new Animal();
    wolf.growl();

  }
}