继承

• 被继承的类为 基类 或者 父类
• 类 只能单继承 不可同时继承多类

Animal.java

public class Animal{
    private  String _animalName;
    public Animal(String animalName){
        this._animalName = animalName;
    }
    protected void skin(String skinName){
        System.out.println( skinName );
    }
    protected void speack(String msg){
        System.out.println( msg );
    }
}

Dog.java

public class Dog extends Animal{
    public Dog(String animalName){
        super(animalName);
    }
    protected void skin(String skinName){
        super.skin(skinName);
    }
    protected void speack(String msg){
        super.speack(msg);
    }
}

Park.java

public class Park{
    public static void main(String[]  args){
        Dog dog = new Dog("dog");
        dog.speack( "=dog=" );
    }
}

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