28.Java基础_抽象类

抽象类的成员特点

public abstract class Animal {
    private String name;
    private int age;
    public Animal() {
    }
    public Animal(String name, int age) {
        this.name = name;
        this.age = age;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public abstract void eat();
}


public class Cat extends Animal{
    public Cat() {
    }
    public Cat(String name, int age) {
        super(name, age);
    }
    @Override
    public void eat(){
        System.out.println("猫吃鱼!");
    }
}

public class Dog extends Animal{
    public Dog() {
    }
    public Dog(String name, int age) {
        super(name, age);
    }
    @Override
    public void eat(){
        System.out.println("狗吃骨头!");
    }
}

public class test {
    public static void main(String[] args) {
        //创建对象
        //无参
        Animal a1=new Cat();
        a1.setName("加菲");
        a1.setAge(5);
        Animal b1=new Dog();
        b1.setName("小黑");
        b1.setAge(6);
        //有参
        Animal a2=new Cat("加菲",5);
        Animal b2=new Dog("小黑",6);

        //输出
        a1.eat();
        a2.eat();
        b1.eat();
        b2.eat();
    }
}