/**
 * @ author      : tangxi.zq
 * @ time        : 2019-06-14
 * @ Description : 多态
 */

class Polymorphism
{
    public static void main(String[]args)
    {
        Income[] incomes = new Income[] {new Income(3000), new SalaryIncome(7500), new RoyaltyIncome(12000)};
        double total = 0;
        for (Income in :incomes)
        {
            total += in.getTax();
        }
        System.out.println("总税费为:" + total);
    }
}



/**
 * 稿费收入税率是20%
 */
class RoyaltyIncome extends Income {

    // TODO

    public RoyaltyIncome(double income)
    {
        super(income);
    }
    @Override
    public double getTax()
    {
        return this.income * 0.2;
    }

}

class SalaryIncome extends Income {

    public SalaryIncome(double income) 
    {
        super(income);
    }

    @Override
    public double getTax() {
        if (income <= 5000) {
            return 0;
        }
        return (income - 5000) * 0.2;
    }
}

class Income {

    protected double income;

    public Income(double income) {
        this.income = income;
    }

    public double getTax() {
        return income * 0.1; // 税率10%
    }

}