Java .类参数不通过构造函数传递

这是我创建和管理对象时的主程序.

public class ShoppingCartManager {

    public static void main(String[] args) {
       
           //when declaring the object it's not changing the values.
       ShoppingCart cart1 = new ShoppingCart("John Doe", "February 1, 2016");
       System.out.println(cart1.getCustomerName());
       
    }

}//end of class

/

这就是类，构造器应该写入类的私有变量，但它们不会更新.

import java.util.ArrayList;

public class ShoppingCart {

    private String customerName = "none";
    private String currentDate = "January 1, 2016";
    //ArrayList<ItemToPurchase> cartItems = new ArrayList<ItemToPurchase>();
    
    //constructor methods
        //this is constructer that it calls
    ShoppingCart(String Name, String Date) {
        //Parameterized constructor which takes the customer name and date as parameters
        String customerName = Name;
        String currentDate = Date;
    }
    ShoppingCart() {
        //String customerName - Initialized in default constructor to "none"
        //String currentDate - Initialized in default constructor to "January 1, 2016"
        String customerName = "none";
        String currentDate = "January 1, 2016";
    }

ShoppingCart(String Name) {
String customerName = Name;
}

    /////////////////////////////////////////////////////
    
    //Getter methods
    
    //getCustomerName
    public String getCustomerName(){
        return customerName;
    }
    //getDate
    public String getDate() {
        return currentDate;
    }
    
    /////////////////////////////////////////////////////

}//end of class

我try 重新创建构造函数并创建新对象.但是对象customerName变量将始终保持默认值"None".