Educoder -- java 封装、继承和多态进阶

Educoder – java 封装、继承和多态进阶

The First One:

package case1;
import java.util.Scanner;

public class Task1{
   
	public static void main(String[] args) {
   
		Scanner sc = new Scanner(System.in);
		String dogName = sc.next();
		String dogSex = sc.next();
		String dogColor = sc.next();
		String catName = sc.next();
		String catSex = sc.next();
		double catWeight = sc.nextDouble();
		// 通过有参构造函数实例化Dog类对象dog
		// dog调用talk()方法
		// dog调用eat()方法
		/********* begin *********/
		Dog d = new Dog(dogName,dogSex,dogColor);
        d.talk();
        d.eat();
		/********* end *********/
		// 通过有参构造函数实例化Cat类对象cat
		// cat调用talk()方法
		// cat调用eat()方法
		/********* begin *********/
		Cat c = new Cat(catName,catSex,catWeight);
        c.talk();
        c.eat();
		/********* end *********/
	}
}

// 抽象类Pet 封装属性name和sex
// 构造函数初始化name和sex
// 声明抽象方法talk()
// 声明抽象方法eat()
abstract class Pet {
   
	/********* begin *********/
	protected  String name;
    protected String sex;
    Pet(String name, String sex)
    {
   
    	this.name = name;
    	this.sex = sex;
    }
    abstract void talk();
    abstract void eat();
	/********* end *********/
}

// Dog类继承自Pet类 封装属性color
// 构造函数初始化name、sex和color
// 实现自己的talk()方法和eat()方法
// talk()输出'名称：name，性别：sex，颜色：color，汪汪叫'
// eat()输出'name吃骨头'
class Dog extends Pet {
   
	/********* begin *********/
	private String color;
    Dog(String name, String sex, String color)
    {
   
        super(name, sex);
        this.color = color;
    }
    public void talk()
    {
   
        System.out.println("名称："+ name +"，性别：" + sex + "，颜色：" + color + "，汪汪叫");
    }
    public void eat()
    {
   
        System.out.println(name + "吃骨头！");
    }
	/********* end *********/
}

// Cat类继承自Pet类 封装属性weight
// 构造函数初始化name、sex和weight
// 实现自己的talk()方法和eat()方法
// talk()输出'名称：name，性别：sex，体重：weight kg，喵喵叫'
// eat()输出'name吃鱼'
class Cat extends Pet {
   
	/********* begin *********/
    private double weight;
    Cat(String name, String sex, double weight)
    {
   
        super(name,sex);
        this.weight = weight;
    }
    public void talk()
    {
   
        Syst