2v.txt

一本关于JBuilder 应用开发的书籍,希望大家喜欢,其实我没看过的,

public class HelloWorld
{
    public static void main(String[] args)
    {
        Dog animal1 = new Dog();
        Cat animal2 = new Cat();
        Duck animal3 = new Duck();
        animal1.sayHello();
        animal2.sayHello();
        animal3.sayHello();
    }
}
class Dog
{
    public void sayHello()
    {
        System.out.println("Bark");
    }
}
class Cat
{
    public void sayHello()
    {
        System.out.println("Meow");
    }
}
class Duck
{
    public void sayHello()
    {
        System.out.println("Quack");
    }
}