Java面向对象之抽象类，接口

//人类
public class Person {
    private String name;
    //自定义属性  引用类型 宠物
    private Pet pet;
    
    public Person() {
        
    }
    
    public Person(String name, Pet pet) {
        this.name = name;
        this.pet = pet;
    }

    public void petHappy() {
        pet.scream();
    }
    
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Pet getPet() {
        return pet;
    }

    public void setPet(Pet pet) {
        this.pet = pet;
    }
}

// 父类宠物类 抽象类
public abstract class Pet {
    private String pname;
    //抽象类可以有构造方法
    public Pet() {
    }

    public Pet(String pname) {
        this.pname = pname;
    }
    //抽象类 的抽象方法   不能有方法体
    public abstract void scream();

    public String getPname() {
        return pname;
    }

    public void setPname(String pname) {
        this.pname = pname;
    }
}

//子类 老虎类
public class Tiger extends Pet {
    public String fur; // 毛的颜色

    public Tiger(String name, String fur) {
        super(name);
        this.fur = fur;
    }

    public Tiger() {
        super();
    }

    @Override
    public void scream() {
        System.out.println("这是一只老虎的声音 !");
    }

    public String getFur() {
        return fur;
    }

    public void setFur(String fur) {
        this.fur = fur;
    }
}

//子类 兔子类
public class Rabbit extends Pet {

    public String fur; // 毛的颜色

    public Rabbit(String name, String fur) {
        super(name);
        this.fur = fur;
    }

    public Rabbit() {
        super();
    }

    @Override
    public void scream() {
        System.out.println("兔子会卖萌 !");
    }

    public String getFur() {
        return fur;
    }

    public void setFur(String fur) {
        this.fur = fur;
    }
}

//主方法
public class Main {
    public static void main(String[] args) {
        Pet t1 = new Tiger("qqqq","www");
        Pet r1 = new Rabbit();
        
        Person p1 = new Person("小明", t1);
        Person p2 = new Person("小红", r1);
        
        p1.petHappy();
        p2.petHappy();
    }
}

public interface InterFaceTest1 {
    public static final String name = "hanqi";
    String pname = "tianqi";
    //接口定义的属性默认public static final
    public void testMethod();
}

//接口1
public interface Inter {
    int AGE=22;//接口中的常量都是全局常量，也就是默认 public全局公共的，static静态，final不可改变的
    public abstract void tell(); 
}

//接口2
public interface Inter2 {
    public abstract void say();
}

//接口3
public interface Inter3 extends Inter,Inter2{
    //接口继承接口
    //一个接口不能继承一个抽象类，但可以继承多个接口，实现接口的多继承
}

//抽象类
public abstract class Chouxc {
    public abstract void write();
}

//子类
public  class Shixian extends Chouxc implements Inter,Inter2{
    public void tell(){
        System.out.println("这是类实现的接口 Inter 的抽象方法");
    }
    public void say(){
        System.out.println("这是类实现的接口 Inter2 中的抽象方法");
    }
    public void write(){
        System.err.println("这是类继承的抽象类中的抽象方法");
    }
}

//主方法
public class InterTest1 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Shixian s=new Shixian();
        s.tell();
        s.say();
        System.out.println(Inter.AGE);
        System.out.println(s.AGE);
    }
}