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运用多态算税

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韬韬蒙塔基

#1 Created at ... [Delete] [Delete and Lock User] 
public class Main {
    public static void main(String[] args) {
        Income[] incomes = new Income[] { new Income(3000), new SalaryIncome(7500), new RoyaltyIncome(12000) };
        double total = 0;

韬韬蒙塔基

#2 Created at ... [Delete] [Delete and Lock User]

题目是不是少了一个普通收入，毕竟程序里创建实例有new Income(3000)

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