Dog.java

1.定义两个类Dog,SmallDog，SmallDog继承Dog
说明一：关于Dog
两个属性，狗的名字(dogName,String)，狗的年龄(dogAge,int)
一个方法，dogWalk()，打印一句话简单描述狗走路的样子
一个构造方法，无参数，在此构造方法中初始化dogName,dogAge
说明二：关于SmallDog
继承Dog，不添加任何属性和方法
最后，在测试类中的main方法中生成SmallDog类的对象，访问属性dogName和dogAge，并打印出他们的值；调用dogWalk()，看看效果

//DogDemoMain.java

public class DogDemoMain {

public static void main(String[] args) {
// TODO Auto-generated method stub
SmallDog sdog = new SmallDog();
System.out.println("The name :" + sdog.getDogName() + " The age :" +
sdog.getDogAge());
sdog.dogWalk();
}

}

//Dog.java

public class Dog {

private String dogName;
private int dogAge;

public Dog(){
dogName="dog";
dogAge=4;

}

public void dogWalk(){

System.out.println("狗走路的样子");
}

public String getDogName() {
return dogName;
}

public void setDogName(String dogName) {
this.dogName = dogName;
}

public int getDogAge() {
return dogAge;
}

public void setDogAge(int dogAge) {
this.dogAge = dogAge;
}

}

//SmallDog.java

public class SmallDog extends Dog {

public SmallDog(){

super();
}

}

package wenwen;

class Dog { String dogName; int dogAge; Dog() { dogName = "Pheebe"; dogAge = 2; } public void dogWalk() { System.out.println("Dog walks by its four legs"); } }

class SmallDog extends Dog { }

public class DogTest { public static void main(String[] args) { SmallDog sd = new SmallDog(); System.out.println("The dog's name is: " + sd.dogName); System.out.println("The dog's age is: " + sd.dogAge); sd.dogWalk(); } }

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