動物樂園

任務描述：

以面向對象思想設計動物樂園系統

動物樂園包括的成員：貓、鴨子，海豚，……

屬性：名稱、腿

方法：叫

設計類圖

使用多態、接口優化設計

編碼實現

分別創建Cat、Duck、Dolphin對象並放到一個數組中，對數組進行遍歷輸出各種動物如何叫，各種動物腿的條數。instanceof判斷動物種類 。

package com.Summer_0428.cn;

abstract class Animal1{
    private String name;
    
 
public Animal1(String name) {
        this.name = name;
    }
    
    public String getName() {
        return name;
    }
    public abstract void show();//定義一個抽象方法
}

interface Terrestrial{
    public int getLegNum();
}

class Cat1 extends Animal1 implements Terrestrial{
    private int
 
 legNum;
    public Cat1(String name,int legNum) {
        super(name);
        this.legNum = legNum;
    }

    @Override
    public int getLegNum() {
        return legNum;
    }
    
    @Override
    public void show() {
        System.out.println("喵喵喵");
    }
    
}

class Duck extends
 
 Animal1 implements Terrestrial{
    private int legNum;
    public Duck(String name,int legNum) {
        super(name);
        this.legNum = legNum;
    }

    @Override
    public int getLegNum() {
        return legNum;
    }
    
    @Override
    public void show() {
        System.out.println("嘎嘎嘎");
    }
    
}

class Dolphin extends Animal1 {

    public Dolphin(String name) {
        super(name);
    }
    
    @Override
    public void show() {
        System.out.println("海豚音");
    }
    
}
public class Zoo {

    public static void main(String[] args) {
        Animal1 animals[] = new Animal1[3];
        animals[0] = new Cat1("加菲貓", 4);
        animals[1] = new Duck("唐小鴨", 2);
        animals[2] = new Dolphin("海豚奇奇");
        
        System.out.println("動物名字\t\t腿的條數\t\t動物叫");
        for (int i = 0; i < animals.length; i++){
            if (animals[i] instanceof Terrestrial) {
                String name = animals[i].getName();
                int legNum = ((Terrestrial) animals[i]).getLegNum();
                System.out.print(name + "\t\t" + legNum + "\t\t");
                animals[i].show();
            } else {
                String name = animals[i].getName();
                System.out.print(name + "\t\t" + 0 + "\t\t");
                animals[i].show();
            }
        }
        

    }

}

面向對象綜合練習題（動物樂園）