Java新手，尝试制作基本程序但遇到问题

New to Java, trying to make a basic program but running into problems

本问题已经有最佳答案，请猛点这里访问。

我正在尝试使用用户输入(几乎只是我自己的)和处理非常小的计算来创建一个基本的计算程序。不过，我似乎无法让计算结果返回。我正在这个文件中进行所有计算：

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public class Drug {

private double goalForQuarter = 3716.0;
private double currentScripts;
private double currentDaysIntoQuarter;
private double scriptsNeededDaily100 = goalForQuarter / currentDaysIntoQuarter;
private double scriptsNeededDaily105 = scriptsNeededDaily100 * 1.05;
private double scriptPercentage = currentScripts / scriptsNeededDaily100;

public Drug () {

}

public Drug (double currentScripts) {
this.currentScripts = currentScripts;
}

public Drug (double currentScripts, double currentDays){
this.currentScripts = currentScripts;
this.currentDaysIntoQuarter = currentDays;
}

public double calcDrug100 (){

return this.scriptPercentage;
}

}

此主程序在此处运行：

导入java.util.scanner；

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public class Main {

public static void main(String[] args){
Scanner reader = new Scanner(System.in);

System.out.print("Input number of days into Quarter:");
double days = Integer.parseInt(reader.nextLine());
System.out.println("Input current number of Scripts:");
double scripts = Integer.parseInt(reader.nextLine());

Drug drug1 = new Drug(scripts, days);

System.out.println(drug1.calcDrug100());

}

}

号

即使有了用户输入，我还是会打印出0.0。我已经玩过我的变量和方法，但似乎不能使它工作。任何帮助都将不胜感激！

scriptPercentage是一个字段。它不会在currentScripts或scriptsNeededDaily100执行时自动更新。

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public double calcDrug100 (){
this.scriptPercentage = this.currentScripts / this.scriptsNeededDaily100;
return this.scriptPercentage;
}