JAVA课程设计通讯录

以下是一个简单的Java通讯录设计示例，它包括添加联系人、删除联系人、查找联系人和显示所有联系人等功能：

import java.util.ArrayList;
import java.util.Scanner;

public class AddressBook {
    private ArrayList<Contact> contacts;

    public AddressBook() {
        contacts = new ArrayList<Contact>();
    }

    public void addContact(Contact contact) {
        contacts.add(contact);
    }

    public void removeContact(Contact contact) {
        contacts.remove(contact);
    }

    public Contact findContact(String name) {
        for (Contact contact : contacts) {
            if (contact.getName().equals(name)) {
                return contact;
            }
        }
        return null;
    }

    public void displayContacts() {
        for (Contact contact : contacts) {
            System.out.println(contact);
        }
    }

    public static void main(String[] args) {
        AddressBook addressBook = new AddressBook();
        Scanner scanner = new Scanner(System.in);
        while (true) {
            System.out.println("请选择操作：");
            System.out.println("1.添加联系人");
            System.out.println("2.删除联系人");
            System.out.println("3.查找联系人");
            System.out.println("4.显示所有联系人");
            System.out.println("5.退出");
            int choice = scanner.nextInt();
            scanner.nextLine();
            switch (choice) {
                case 1:
                    System.out.println("请输入联系人姓名：");
                    String name = scanner.nextLine();
                    System.out.println("请输入联系人电话：");
                    String phone = scanner.nextLine();
                    Contact contact = new Contact(name, phone);
                    addressBook.addContact(contact);
                    System.out.println("联系人添加成功！");
                    break;
                case 2:
                    System.out.println("请输入联系人姓名：");
                    String name2 = scanner.nextLine();
                    Contact contact2 = addressBook.findContact(name2);
                    if (contact2 != null) {
                        addressBook.removeContact(contact2);
                        System.out.println("联系人删除成功！");
                    } else {
                        System.out.println("联系人不存在！");
                    }
                    break;
                case 3:
                    System.out.println("请输入联系人姓名：");
                    String name3 = scanner.nextLine();
                    Contact contact3 = addressBook.findContact(name3);
                    if (contact3 != null) {
                        System.out.println(contact3);
                    } else {
                        System.out.println("联系人不存在！");
                    }
                    break;
                case 4:
                    addressBook.displayContacts();
                    break;
                case 5:
                    System.exit(0);
                    break;
                default:
                    System.out.println("输入有误，请重新输入！");
                    break;
            }
        }
    }
}

class Contact {
    private String name;
    private String phone;

    public Contact(String name, String phone) {
        this.name = name;
        this.phone = phone;
    }

    public String getName() {
        return name;
    }

    public String getPhone() {
        return phone;
    }

    public String toString() {
        return "姓名：" + name + "，电话：" + phone;
    }
}