Question

我正在编写一个简单的按钮，可在单击时创建新的联系人。我知道这个错误是由于公开声明和私人声明而发生的，但我无法弄清楚这是发生了什么。我已经导入了联系的课程，但我被困住了。

import java.util.*;


 class Contact {

 private List<Contact> contacts = new LinkedList<Contact>();
private int nextId = 0;

public Contact add(Contact contact) {
    contact.setId(++nextId);
    contacts.add(contact);
    return contact;
}
private String firstName = "";
private String lastName = "";
private String email = "";

这是代码呼叫联系人

import domain.*;
import javax.swing.JOptionPane;

public class MainUI extends javax.swing.JFrame {

private Account account = null;

public void setAccount(Account account) {
    this.account = account;
}


 Contact contact = new Contact(); // Error is here
    contact.setFirstname(firstNameFld.getText());
    contact.setLastname(lastNameFld.getText());
    contact.setEmail(emailFld.getText());
    contact.setPhone(phoneFld.getText());

    boolean isValid = contact.validate();
    if(!isValid) {
        JOptionPane.showMessageDialog(this, "All fields are required for a Contact", "Error", JOptionPane.ERROR_MESSAGE);
    return;
    }
    JOptionPane.showMessageDialog(this, "Your new Contact has been saved", "Saved Contact", JOptionPane.INFORMATION_MESSAGE);
    firstNameFld.setText("");
    lastNameFld.setText("");
    emailFld.setText("");
    phoneFld.setText("");
}

Answer 1

您的联系类是私有的，将其更改为公开或将类移动到同一个包。

....域名不公开;无法从外部包裹访问

1 个答案: