老师，还有需要改进的吗

package com.imooc.method;

public class DisCountTest {

public void DisCount(double sum) {

double getsum;

if (sum < 100) {

getsum = sum;

} else if (sum < 200) {

getsum = sum * 0.95;

} else {

getsum = sum * 0.85;

}

System.out.println("折后商品总价为：" + getsum);

}

public static void main(String[] args) {

DisCountTest d = new DisCountTest();

double price = 150;

d.DisCount(price);

}

}