public class Main {
public static void main(String[] args){ Income[] incomes = new Income[]{ new Income(0), new Salary(6000), new Contribution(4500) }; System.out.println(totalTax(incomes)); } public static double totalTax(Income...incomes){ double total = 0; for (Income income: incomes){ total = total + income.getTax(); } return total; } static class Income{ protected double income; public Income(double income){ this.income = income; } public double getTax() { return income * 0.1; } } static class Salary extends Income{ public Salary(double income){ super(income); } @Override public double getTax(){ if(income <= 5000){ return 0; } return (income - 5000) * 0.2; } } static class Contribution extends Income{ public Contribution(double income){ super(income); } @Override public double getTax(){ if(income <= 4000){ return (income - 800)*0.2*(1-0.3); } return (income * 0.8)*0.2*(1-0.3); } }}
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Im袁国伟