设计一个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

privateStringname;
privateStringcolor;
privateintage;
publicDog(){
}
publicDog(Stringname,Stringcolor,intage){
super();
this.name=name;
this.color=color;
this.age=age;
}
publicStringtoString(){
return"狗的名字："+this.name+"，狗的颜色："+this.color+"，狗的年龄："+this.age;
}
//setter、getter略
}
publicclassTestDemo{
publicstaticvoidmain(Stringargs[]){
Dogdog=newDog("金毛","金黄色",3);
System.out.println(dog);
}
}