Question

JAVA课作业，求救！！！

1. 定义一个描述宠物的抽象类Pet,包含重量（weight）和年龄(age)两个成员变量和显示宠物资料的showInfo方法及获取宠物资料的getInfo方法。
2. 设计一个可吃的接口Eatable，包含一个被吃(beEatted)方法，方法返回值类型为String。
3. 由Pet类继承得到猫类(Cat)和狗类（Dog），添加叫声（cry）的成员变量，并重写Pet类的相关方法；狗类要实现Eatable接口，返回“吃了一顿狗肉！”字符串。
4. 设计一个水果类（Fruit），包含颜色（color）和产地（address）两个成员变量。和显示水果资料的showInfo方法以及获取水果资料的getInfo方法；水果类要实现Eatable接口，返回“吃了一个水果！”字符串。
5. 由水果类（Fruit）继承得到香蕉（Banana）类；创建两个构造方法，一个带参数，一个不带参数；重写显示水果资料的showInfo方法以及获取水果资料的getInfo方法。
6. 由水果类（Fruit）继承得到苹果（Apple）类；添加一个品种（type）的成员变量和获取品种的成员方法（getType）；创建两个构造方法，一个带参数，一个不带参数；重写显示水果资料的showInfo方法以及获取水果资料的getInfo方法。
7. 创建测试程序Programs类，包含main方法，在main方法中声明和创建4个实例：猫、狗、苹果和香蕉，调用显示资料的方法输出对象的详细信息；

初学者，只会写头两个，还不知道对不对 有没哪位大侠能帮个忙，多谢！！！

Answer 1

// 第一题
package com.zhidao;

public abstract class Pet {
protected int weight;
protected int age;

public void showInfo(){
System.out.println("weight: " + weight);
System.out.println("age: " + age);
}

public void getInfo(){
weight = 2;
age = 1;
}
}

//第二题
package com.zhidao;

public interface Eatable {
String beEatted();
}

//第三题
package com.zhidao;

public class Cat extends Pet {
private String cry;

public void showInfo(){
System.out.println("weight of Cat: " + weight);
System.out.println("age of Cat: " + age);
System.out.println("cry of Cat: " + cry);
}

public void getInfo(){
weight = 12;
age = 3;
cry = "Miao~";
}
}

package com.zhidao;

public class Dog extends Pet implements Eatable {

public String beEatted() {
return "吃了一顿狗肉！";
}
}

//第四题
package com.zhidao;

public class Fruit implements Eatable {
protected String color;
protected String address;

public void showInfo(){
System.out.println("color:" + color);
System.out.println("address" + address);
}

public void getInfo(){
color = "no color";
address = "no address";
}

public String beEatted() {
return "吃了一个水果！";
}
}

//第五题
package com.zhidao;

public class Banana extends Fruit {
public Banana(){
this.color = "yellow";
this.address = "HaiNan";
}

public Banana(String color, String address){
this.color = color;
this.address = address;
}

public void showInfo(){
System.out.println("color of Banana: " + color);
System.out.println("address of Banana: " + address);
}
}

//第六题
package com.zhidao;

public class Apple extends Fruit {
private String type;

public String getType() {
return type;
}

public Apple(){
this.color = "Red";
this.address = "Hebei";
this.type = "FuShi";
}

public Apple(String color, String address, String type){
this.color = color;
this.address = address;
this.type = type;
}

public void getInfo(){
color = "yellow";
address = "ShanDong";
type = "HuangYuanShuai";
}

public void showInfo(){
System.out.println("color of Apple: " + color);
System.out.println("address of Apple: " + address);
System.out.println("type of Apple: " + type);
}
}

// 第七题
package com.zhidao;

public class Programs {

public static void main(String[] args) {
Cat cat = new Cat();
Dog dog = new Dog();
Apple apple = new Apple();
Banana banana = new Banana();

cat.getInfo();
cat.showInfo();

dog.getInfo();
dog.showInfo();
System.out.println(dog.beEatted() + "\n");

apple.showInfo();
apple.getInfo();
apple.showInfo();
System.out.println(apple.beEatted() + "\n");

banana.showInfo();
banana.getInfo();
banana.showInfo();

apple = new Apple("green", "LiaoNing", "Suan");
apple.showInfo();
banana = new Banana("green", "GuanXi");
banana.showInfo();
}

}

// 还有不明白的地方再问我~~

Answer 2

写java程序至少基础要打牢，接口和类要有明确的概念。这道题要有一个接口：Eatable接口;两个抽象类：Pet类和Fruit类;四个子类：猫、狗、苹果和香蕉;一个测试类：Programs类(有main方法);

Answer 3

这题写出来简单，不过你应该自己再写写，这个接口和类是很基础的，必须自己弄会。

Answer 4

你不是不会你是不想会，现在网上资源那么多，想学点什么学不到，你嫌麻烦别人也嫌麻烦