急急急！！！谢谢

package 兰倩;

public class dog {
public static void main(String args[]){
dog dog=new dog();
System.out.println("姓名："+dog.name);
System.out.println("年龄:"+dog.age);
System.out.println("颜色:"+dog.color);
System.out.println("体重:"+dog.weight);
System.out.println("性别:"+dog.sex);
dog.eat();
dog.look();
dog.yao();
dog.run();
dog.swim();
}

int age =5;
String name="乐乐";
String color="白色";
int weight =10;
String sex="female";
void eat()
{
}
void look()
{
}
void yao()
{
}
void run()
{
}
void swim()
{
}
{System.out.println("狗狗喜欢吃肉");
System.out.println("狗狗可以看门");
System.out.println("旺旺~~~~~");
System.out.println("狗狗跑的很快");
System.out.println("会游泳");

}
public class dog1 extends dog

{ public dog1(){
super();

}
    public class dog2 extends dog
    {public dog2(){
    super();
   
    }
    }
}
}老师要求建立一个父类，有五个成员方法，五个成员变量。然后再建两个子类，分别用完全继承部分继承等七种方法实现继承父类，最后再建一个主类，实现主类与子类的继承关系求帮助怎么改啊。