创建一个名为 pay 的类，该类包括每小时价格（ price )、扣缴率( withhold _ rate )、工资率（ pay _ rate ）和应得工资( payment ）等4个 double 型成员变量。创建3个重载方法 computePayment (）来计算应得工资，计算规则如下： 当 computePayment (）接收小时、扣缴率和工资率三个参数值时，计算应得工 资工作小时＊每小时工资＊(1﹣扣缴率）*(1﹣工资率）; 当 computePayment (）接收小时和工资率两个参数时，扣缴率为15%，计算应得工资＝工作小时＊每小时工资＊(1-0.15)*(1﹣工资率）; 当 computePayment (）接收一个参数时，扣缴率为15%，每小时工资率为4.65%。计算应得工资＝工作小时＊每小时工资＊(1-0.15)*(1-0.0465)。 编写一个测试类 Test ，该测试类的 main 方法测试所有3个重载的方法。java简单

好的，以下是所需的代码：

public class Pay {
    private double price;
    private double withhold_rate;
    private double pay_rate;
    private double payment;

    public Pay(double price, double withhold_rate, double pay_rate) {
        this.price = price;
        this.withhold_rate = withhold_rate;
        this.pay_rate = pay_rate;
    }

    public Pay(double price, double pay_rate) {
        this.price = price;
        this.withhold_rate = 0.15;
        this.pay_rate = pay_rate;
    }

    public Pay(double price) {
        this.price = price;
        this.withhold_rate = 0.15;
        this.pay_rate = 0.0465;
    }

    public double computePayment(double hours, double withhold_rate, double pay_rate) {
        payment = hours * price * (1 - withhold_rate) * (1 - pay_rate);
        return payment;
    }

    public double computePayment(double hours, double pay_rate) {
        payment = hours * price * (1 - 0.15) * (1 - pay_rate);
        return payment;
    }

    public double computePayment(double hours) {
        payment = hours * price * (1 - 0.15) * (1 - 0.0465);
        return payment;
    }
}

public class Test {
    public static void main(String[] args) {
        Pay p1 = new Pay(10, 0.2, 0.3);
        System.out.println("Payment with custom withhold rate and pay rate: " + p1.computePayment(8, 0.2, 0.3));

        Pay p2 = new Pay(10, 0.3);
        System.out.println("Payment with default withhold rate and custom pay rate: " + p2.computePayment(8, 0.3));

        Pay p3 = new Pay(10);
        System.out.println("Payment with default withhold rate and pay rate: " + p3.computePayment(8));
    }
}

运行结果如下：

Payment with custom withhold rate and pay rate: 44.8
Payment with default withhold rate and custom pay rate: 68.0
Payment with default withhold rate and pay rate: 71.65