重载方法不更改对象中的值

Question

所以我在 main class 中有两个重载方法，我试图用它们来设置对象的值。这些方法是从另一个 class 使用的，但它似乎没有做任何事情。当我使用显示方法时，它打印出 Customer 的原始值，而不是该方法设置的新值。

public class Customer {
    int customerID = 0;
    String name = "Name required";
    String address = "Address required";
    String phoneNumber = "Phone Required";
    String eMail = "email optional";

    public void setCustomerInfo(int ID, String nm, String addr, String phn) {
        int customerID = ID;
        String name = nm;
        String address = addr;
        String phoneNumber = phn;
    }

    public void setCustomerInfo(int ID, String nm, String addr, String phn, String mail) {
        int customerID = ID;
        String name = nm;
        String address = addr;
        String phoneNumber = phn;
        String eMail = mail;
    }

    public void display() {
        System.out.println("Customer ID: " + customerID);
        System.out.println("Customer Name: " + name);
        System.out.println("Customer Address: " + address);
        System.out.println("Customer Phone Number: " + phoneNumber);
        System.out.println("Customer Email Address: " + eMail);
    }
}

-

public class CustomerTest {
    public static void main(String args[]) {
        Customer c1 = new Customer();
        Customer c2 = new Customer();

        c1.setCustomerInfo(1, "Greg", "123 Real Street", "1234-5678");
        c2.setCustomerInfo(2, "Mike", "123 Fake Street", "9876-5432", "RealEmails@Emails.com");

        System.out.println(c1.name);

        c1.display();
        c2.display();
    }
}

但是程序打印来自 Customer 实例的初始值：

Name required
Customer ID: 0
Customer Name: Name required
Customer Address: Address required
Customer Phone Number: Phone Required
Customer Email Address: email optional
Customer ID: 0
Customer Name: Name required
Customer Address: Address required
Customer Phone Number: Phone Required
Customer Email Address: email optional

Answer 1

您的方法正在为局部变量而不是 class 成员赋值。将它们更改为：

public void setCustomerInfo(int ID, String nm, String addr, String phn) {

    customerID = ID;
    name = nm;
    address = addr;
    phoneNumber = phn;
}

public void setCustomerInfo(int ID, String nm, String addr, String phn, String mail) {

    customerID = ID;
    name = nm;
    address = addr;
    phoneNumber = phn;
    eMail = mail;
}

重载方法不更改对象中的值

Overload method not changing values in object

java

methods