计一个Dog类，有名字、颜色、年龄等属性，定义构造方法来初始化类的这些属性，定义方法输出dog信息，编写程序使用Dog类。 ```java //狗类 public class Dog{ private String name; private String color; private int age; public Dog() {} public Dog(String name,String color,int age) { this.name=name; this.color=color; this.age=age; } //setter、getter方法略写 public String getInfo() { return "姓名："+this.name+"、颜色："+this.color+"、年龄："+this.age; } } //测试类 public class Test { public static void main(String args[]) { Dog dog=new Dog("小胖","黄棕色",6); System.out.println(dog.getInfo()); } } ```