如何从另一个类调用变量

如何解决如何从另一个类调用变量

当我运行它时，我刚刚完成了Java代码，它不输出任何值。 我有两个类，一个是使用jOption输入值的类，另一个是使用第一类输入值来计算利息的类。

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  ); 
          }
           
        
         
         
       
       
       
        
        
    }
    
}

第二堂课

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;

在第一堂课中，有一个if语句，如果还款月数大于3，则运行其他方法，一旦我输入的数字大于3，它将运行getinterest方法，但输出为：

Output

我认为我没有正确链接这两个类，但是我不知道该怎么做， 我似乎在这里找不到逻辑错误，请帮帮我

这是我的主要课程

public static void main（String [] 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) );
    
  

}