我的公开课未在程序中声明

Question

在我创建的下面的程序中，它不允许我运行它，因为它声称该类是公共的，应声明。如何修复它，以便成功运行程序？谢谢。

这是我的完整代码：

class Dog {
    String name;
    int size;
    // This is where the object is created in which the different dogs are given an attribute which in this case is a name which is a variable type string.
    public void bark() {
        if (size > 60) {
            System.out.println(name+"says ruff!");
        } else {
            System.out.println(name +" says yip!");
        }
    }
    public void play() {
        System.out.println("woooooohoooooooooo mans playing games");
    }
}
// This public class is the second class in which the method is tested and its where the different dogs are named and new dogs arrive.
public class DogTestDrive {
    public static void main(String[] args) { 
        Dog dog1 = new Dog();
        dog1.name = "Bart";
        dog1.size = 100;
        Dog[] myDogs = new Dog[2]; // here is where the array of the dogs begins and it has already set the position to 2 
        myDogs[0] = new Dog();
        // my dogs is a new class 
        myDogs[1] = dog1;
        myDogs[0].name = "Fred";
        myDogs[0].size = 43;
        // This is where an array with the different dogs names were stored - these can count as attributes. 
        int x = 0;
        while (x < myDogs.length) {
            myDogs[x].bark();
            myDogs[x].play();
            x = x + 1;
        }
    }
}

Answer 1

您声明了两个类i同一文件。

错误消息说，最高公共类应在自己的文件中声明，其名称与类相同的名称，就像评论中提到的@roddyofthefrozenpeas一样。

因此，您必须创建一个名为 Dog.java的文件，如 @cricket_007，并在其中移动Dog类。