如果在setter / getter中创建

Question

Java相当新，希望在使用setter / getters并使用toString方法创建输出时存储乘客详细信息方面有所帮助。

The problem I have is, say I am storing the passengers phone number and don't want their phone number to contain any characters, have a length of 10 numbers and start with 1 and return "Not Valid" if one of these occur.

I have tried to create if statements in the setter but it is not returning the "Not Valid". This is what I have so far

public class Passenger {

    private String name;
    private String location;
    private String phoneNumber;

    public Passenger(String name, String location, String phoneNumber) {
        this.name = name;
        this.location = location;
        this.phoneNumber = phoneNumber;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getLocation() {
        return location;
    }

    public void setLocation(String location) {
        this.location = location;
    }

    public String getPhoneNumber() {
        return phoneNumber;
    }

    public void setPhoneNumber(String phoneNumber) {
        if (phoneNumber.matches("[a-zA-z]+)")) {
            phoneNumber = "Not Valid";
        } 
        else if (phoneNumber.length() > 10) {
            phoneNumber = "Not Valid";
        }

        else if (phoneNumber.startsWith("1")){
            phoneNumber = "Not Valid";
        }
        else {
        this.phoneNumber = phoneNumber;
        }
    }

    public String toString() {
        return " Name: " + name + "\n Location: " + location + "\n Phone Number: " + phoneNumber;

  public class Test {

    public static void main(String[] args) {

        Passenger one = new Passenger("John John", "China", "1231231234");
        Passenger two = new Passenger("John John", "China", "A");
        Passenger three = new Passenger("John John", "China", "2323232323");
        Passenger four = new Passenger("John John", "China", "123123123123");
        System.out.println(one);
        System.out.println(two);
        System.out.println(three);
        System.out.println(four);
    }

For passenger two, three and four I would expect phone number to show Not Valid, but they are showing the values which were put in.

Any help would be grateful

Answer 1

在类的构造函数中使用 setPhoneNumber 方法

public Passenger(String name, String location, String phoneNumber) {
    this.name = name;
    this.location = location;
    this.setPhoneNumber(phoneNumber);
}