java10/12今日总结

public class Zoo 
{

    public static void main(String args[])
    {

        Feeder f = new Feeder("小李");

        // 饲养员小李喂养一只狮子

        f.feedLion(new Lion());

        // 饲养员小李喂养十只猴子

        for (int i = 0; i < 10; i++)
         {

            f.feedMonkey(new Monkey());

        }
        
        // 饲养员小李喂养5只鸽子

        for (int i = 0; i < 5; i++)
         {

            f.feedPigeon(new Pigeon());

        }
    
    }

}


class Feeder 
{


    public String name;


    public Feeder(String name)
    {

        this.name = name;

    }

    
    public void feedLion(Lion l)
    {

        l.eat();

    }

    
    public void feedPigeon(Pigeon p)
    {

        p.eat();

    }

    
    public void feedMonkey(Monkey m)
    {

        m.eat();

    }

}


class Lion
{


    public void eat() 
    {

        System.out.println("我不吃肉谁敢吃肉！");

    }

}


class Monkey 
{

    public void eat() 
    {

        System.out.println("我什么都吃，尤其喜欢香蕉。");

    }

}


class Pigeon 
{


    public void eat() 
    {

        System.out.println("我要减肥，所以每天只吃一点大米。");

    }

}

 

动物园代码

public final class Address
{
    private final String detail;
    private final String postCode;

    //在构造方法里初始化两个实例属性
    public Address()
    {
        this.detail = "";
        this.postCode = "";

    }
    public Address(String detail , String postCode)
    {
        this.detail = detail;
        this.postCode = postCode;
    }
    //仅为两个实例属性提供getter方法
    public String getDetail()
    {
         return this.detail;
    }

    public String getPostCode()
    {
         return this.postCode;
    }
    //重写equals方法，判断两个对象是否相等。
    public boolean equals(Object obj)
    {
        if (obj instanceof Address)
        {
            Address ad = (Address)obj;
            if (this.getDetail().equals(ad.getDetail()) && this.getPostCode().equals(ad.getPostCode()))
            {
                return true;
            }
        }
        return false;
    }
    public int hashCode()
    {
        return detail.hashCode() + postCode.hashCode();
    }
}