当我运行java代码时，它没有输出任何值。我有两个类一个类使用joption输入值，另一个类使用第一个类输入值来计算利息。
第1类：

public class Employee_Details {

 String custName;
 String custNuum;
 String priice;
 String Month;
 int custNum;
 double price;
 int reMonth;
 double total;
 double reAmount;

    public void getDetails (){

       Finance_Period fin1 = new Finance_Period();

        custName = JOptionPane.showInputDialog("Please enter Customer Name");
         custNuum = JOptionPane.showInputDialog("Please enter Customer Number");
        custNum = Integer.parseInt(custNuum);
     priice = JOptionPane.showInputDialog("Please enter price of product");
     price = Double.parseDouble(priice);
        Month = JOptionPane.showInputDialog("Please enter number of repayment months");
        reMonth = Integer.parseInt(Month);

         reAmount = price/reMonth;

          if (reMonth >3){
            fin1.getInterest();
          }
            else  {
              total = price;

             JOptionPane.showMessageDialog(null,"Customer Name: " + custName + "\n" + "Customer Conatct: " + custNum + "\n" + "Product Amount: " + "R"+price + "\n" + "Repayment Months: " + reMonth + "\n" +"Monthly Repayments: " + "R" +reAmount + "\n" + "Total Due: " + "R" + total  ); 
          }

    }

}

二等舱：

public class Finance_Period {

double interest;
String name;
int num;
double product;
double amount;

public double getInterest(){
    Employee_Details cust1 = new Employee_Details();

        interest = (0.25 * cust1.reAmount) + cust1.reAmount;

    JOptionPane.showMessageDialog(null,"Customer Name: " + cust1.custName+ "\n" + "Customer Conatct: " + cust1.custNum + "\n" + "Product Amount: " + "R"+cust1.price + "\n" + "Repayment Months: " + cust1.reMonth + "\n" +"Monthly Repayments: " + "R" + cust1.reAmount + "\n" + "Total:" + "R" + (cust1.reAmount + interest) );

    return interest;

在第一个类中，有一个if语句，它表示如果偿还月份大于3，则运行其他方法，一旦我输入一个大于3的数字，它将运行getinterest方法，但输出是：
输出
我相信我没有正确连接这两个类，但我不知道还有什么要做的，我似乎不能找到这里的逻辑错误请帮助我
这是我的主课
public static void main（字符串[]args）{

Employee_Details cust1 = new Employee_Details();
cust1.getDetails();
 Finance_Period fin1 = new Finance_Period();

 JOptionPane.showMessageDialog(null,"Customer Name: " + cust1.custName+ "\n" + "Customer Conatct: " + cust1.custNum + "\n" + "Product Amount: " + "R"+cust1.price + "\n" + "Repayment Months: " + cust1.reMonth + "\n" +"Monthly Repayments: " + "R" + cust1.reAmount + "\n" + "Total:" + "R" + (cust1.reAmount + fin1.interest) );

}