在Java中的基本数学计算

我正在学习Java，并且正在开发一个基本程序，用户可以输入一个成本金额、通胀百分比和时间（年份），以便计算包含通胀的成本。\n我使用了三个类，1个应用程序类，1个驱动程序类和1个单一类。我这样做是为了按照书本上的要求来构建面向对象的技能（我知道还有更简单的过程化/结构化方法，但这不是我练习的重点）。\n我遇到的问题是，无论我输入什么数字，输出的答案都是0美元。这显然不应该是这样的。如果有人能够请快速浏览我的代码并指点我方向，我将不胜感激。\n应用程序类：\n

package priceestimator;
 public class PriceEstimator {
    public static void main(String[] args) {
        CostCalculator CostCalc = new CostCalculator();
        CostCalc.calculateCost();
    }
}

\n驱动程序类：\n

public class CostCalculator {
    public void calculateCost(){
       Calculator calculator = new Calculator();
       calculator.calculator();
       Calculator years = new Calculator();
       years.years();
       Calculator inflation = new Calculator();
       inflation.inflation();     
       Calculator price = new Calculator();  
       price.price();
    }
}

\n单一类：\n

package priceestimator;
import java.util.Scanner;
public class Calculator {
    private Scanner myScanner = new Scanner(System.in);       
    private double cost;
    private double time;
    private double costDif;     
    private void setTime(int time){
        this.time = time;
    }
    private double getTime(){
        return time;
    }        
    private void setCost(double cost){
        this.cost = cost;
    }
    private double getCost(){
        return cost;
    }
    private void setCostDif(double costDif){
        this.costDif = costDif;
    }
    private double getCostDif(){
        return costDif;
    }
    private void getMyScanner(){
       this.myScanner = myScanner;
    }
    public void calculator(){
        System.out.println("Enter the current cost (numbers only):");
        cost = myScanner.nextDouble();                
   } 
    public void years(){
        System.out.println("Enter the time difference in years:");
        time = myScanner.nextDouble();        
  }
    public void inflation(){
        double costTimeDif;
        double decimalConversion; 
        int percent = 100;
        double input; 
        System.out.println("Enter the current inflation rate percentage (numbers only):");
        input = myScanner.nextDouble(); 
        decimalConversion = input / percent;
        costTimeDif = time * decimalConversion;
        costDif = cost * costTimeDif;                
    }
     public void price(){  
        double price;
        price = costDif + cost;
        System.out.println("The estimated price is: $" + price);
    }    
}

\n感谢您的时间。