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我想要获取用Java创建的联系人列表。我认为我有很多，但我相信它可以得到提高。我相信我可以将项目添加到数组列表，但是，当我尝试打印数组列表时，我会收到一些随机文本和数字。另外，我不会因为通过联系人ID号识别而丢失，然后只是打印该联系人。任何对材料的帮助或引用都会有很大帮助！我试过通过课本和在线研究，说实话，现在我更加困惑。这里是我的代码： 主营：试图让我的数组列表打印给定的项目
package contactslist;
import java.util.*;
import java.io.*;
public class ContactsList {
public static void main(String[] args) {
Scanner input1 = new Scanner(System.in);
int type = 0;
ArrayList<Contacts> contacts = new ArrayList<Contacts>();
while(type != 4){
System.out.println("[1] Personal Contact");
System.out.println("[2] Business Contact");
System.out.println("[3] Display Contacts");
System.out.println("[4] to quit");
type = input1.nextInt();
if(type == 4){
System.out.println("Goodbye");
break;
}
else if (type == 3){
int totalContacts = contacts.size();
for (int i = 0; i < totalContacts; i++){
System.out.print(contacts);
}
}
Scanner inputs = new Scanner(System.in);
System.out.println("Please enter a numeric ContactId: ");
String contactId = inputs.nextLine();
System.out.println("Please enter First Name: ");
String firstName = inputs.nextLine();
if (firstName == null) {
break;
}
System.out.println("Please enter Last Name: ");
String lastName = inputs.nextLine();
if (lastName == null) {
break;
}
System.out.println("Please enter Address: ");
String address = inputs.nextLine();
System.out.println("Please enter Phone Number: ");
String phoneNumber = inputs.nextLine();
System.out.println("Please enter Email Address: ");
String emailAddress = inputs.nextLine();
if(type == 1){
System.out.println("Please enter Birthday: ");
String dateofBirth = inputs.nextLine();
Contacts personal = new PersonalContact(contactId, firstName, lastName, address,
phoneNumber, emailAddress, dateofBirth);
contacts.add(personal);
}
else if(type == 2){
System.out.println("Please enter Job Title: ");
String jobTitle = inputs.nextLine();
System.out.println("Please enter Organization: ");
String organization = inputs.nextLine();
Contacts business = new BusinessContact(contactId, firstName, lastName,
address, phoneNumber, emailAddress, jobTitle, organization);
contacts.add(business);
}
}
}
}
联系人类别：
package contactslist;
import java.util.*;
import java.io.*;
public abstract class Contacts {
String contactId;
String firstName;
String lastName;
String address;
String phoneNumber;
String emailAddress;
public Contacts(String contactId,String firstName,String lastName, String address,
String phoneNumber, String emailAddress)
{
this.contactId = contactId;
this.firstName = firstName;
this.lastName = lastName;
this.address = address;
this.phoneNumber = phoneNumber;
this.emailAddress = emailAddress;
}
public void setContactId(String input){
this.contactId = input;
}
public String getContactId(){
return contactId;
}
public void setFirstName(String input){
this.firstName = input;
}
public String getFirstName(){
return firstName;
}
public void setLastName(String input){
this.lastName = input;
}
public String getLastName(){
return lastName;
}
public void setAddress(String input){
this.address = input;
}
public String getAddress(){
return address;
}
public void setPhoneNumber(String input){
this.phoneNumber = input;
}
public String getPhoneNumber(){
return phoneNumber;
}
public void setEmailAddress(String input){
this.emailAddress = input;
}
public String getEmailAddress(){
return emailAddress;
}
public void displayContacts(){
System.out.println("Contact ID: " + contactId + " First Name: " + firstName + "
Last Name: " + lastName);
}
}
个人亚纲：
package contactslist;
import java.util.*;
import java.io.*;
public class PersonalContact extends Contacts{
private String dateofBirth;
public PersonalContact(String contactId, String firstName, String lastName, String
address, String phoneNumber, String emailAddress, String dateofBirth){
super(contactId, firstName, lastName, address, phoneNumber, emailAddress);
this.dateofBirth = dateofBirth;
}
public void setDateofBirth(String input){
this.dateofBirth=input;
}
public String getDateofBirth(){
return this.dateofBirth;
}
@Override
public void displayContacts(){
System.out.print("Personal Contacts: ");
System.out.println("Contact ID: " + contactId + " First Name: " + firstName + " Last
Name: " + lastName);
System.out.println("Address: " + address);
System.out.println("Phone Number: " + phoneNumber);
System.out.println("Email Address: " + emailAddress);
System.out.println("Birthday: " + dateofBirth);
}
}
业务子类：
package contactslist;
public class BusinessContact extends Contacts{
private String jobTitle;
private String organization;
public BusinessContact(String contactId, String firstName, String lastName, String
address, String phoneNumber, String emailAddress, String jobTitle, String organization)
{
super(contactId, firstName, lastName, address, phoneNumber, emailAddress);
this.jobTitle = jobTitle;
this.organization = organization;
}
public void jobTitle(String input){
this.jobTitle = jobTitle;
}
public String getjobTitle(){
return this.jobTitle;
}
public void organization(String input) {
this.organization = organization;
}
public String getOrganization(){
return this.organization;
}
@Override
public void displayContacts(){
System.out.print("Personal Contacts: ");
System.out.println("First Name: " + firstName + " Last Name :" + lastName);
System.out.println("Address: " + address);
System.out.println("Phone Number: " + phoneNumber);
System.out.println("Email Address: " + emailAddress);
System.out.println("Job Title: " + jobTitle);
System.out.println("Orgnanization: " + organization);
}
}
而这里就是打印，当我选择选项3，显示联系人。
错误：
[[email protected]]
任何帮助将不胜感激。我疯了，请原谅我的问题。我尝试了一些我用Google搜索过的不同的东西，但我只是没有得到它。有人能指引我正确的方向，还是给我一个很好的参考网站？
现在我知道了，非常感谢。现在进入下一部分。 – mbnew