代码

好的，以下是一个简单的Java电话号码查询系统的代码示例，仅供参考：

PhoneNumber.java

public class PhoneNumber {
    private String name;
    private String mobileNumber;
    private String fixedNumber;
    
    public PhoneNumber(String name, String mobileNumber, String fixedNumber) {
        this.name = name;
        this.mobileNumber = mobileNumber;
        this.fixedNumber = fixedNumber;
    }
    
    public String getName() {
        return name;
    }
    
    public String getMobileNumber() {
        return mobileNumber;
    }
    
    public String getFixedNumber() {
        return fixedNumber;
    }
    
    public void setMobileNumber(String mobileNumber) {
        this.mobileNumber = mobileNumber;
    }
    
    public void setFixedNumber(String fixedNumber) {
        this.fixedNumber = fixedNumber;
    }
    
    @Override
    public String toString() {
        return "Name: " + name + ", Mobile: " + mobileNumber + ", Fixed: " + fixedNumber;
    }
}

PhoneNumberManager.java

import java.util.ArrayList;
import java.util.List;

public class PhoneNumberManager {
    private List<PhoneNumber> phoneNumbers;
    
    public PhoneNumberManager() {
        phoneNumbers = new ArrayList<>();
    }
    
    public void addPhoneNumber(PhoneNumber phoneNumber) {
        phoneNumbers.add(phoneNumber);
    }
    
    public void deletePhoneNumber(int index) {
        phoneNumbers.remove(index);
    }
    
    public void updatePhoneNumber(int index, String mobileNumber, String fixedNumber) {
        PhoneNumber phoneNumber = phoneNumbers.get(index);
        phoneNumber.setMobileNumber(mobileNumber);
        phoneNumber.setFixedNumber(fixedNumber);
    }
    
    public PhoneNumber searchPhoneNumber(String name) {
        for (PhoneNumber phoneNumber : phoneNumbers) {
            if (phoneNumber.getName().equals(name)) {
                return phoneNumber;
            }
        }
        return null;
    }
    
    public void printAllPhoneNumbers() {
        for (PhoneNumber phoneNumber : phoneNumbers) {
            System.out.println(phoneNumber);
        }
    }
}

Main.java

import java.util.Scanner;

public class Main {
    private static Scanner scanner = new Scanner(System.in);
    private static PhoneNumberManager phoneNumberManager = new PhoneNumberManager();
    
    public static void main(String[] args) {
        boolean exit = false;
        while (!exit) {
            printMenu();
            int choice = scanner.nextInt();
            scanner.nextLine(); // consume the newline character
            
            switch (choice) {
                case 1: // add
                    addPhoneNumber();
                    break;
                case 2: // delete
                    deletePhoneNumber();
                    break;
                case 3: // update
                    updatePhoneNumber();
                    break;
                case 4: // search
                    searchPhoneNumber();
                    break;
                case 5: // print all
                    printAllPhoneNumbers();
                    break;
                case 6: // exit
                    exit = true;
                    break;
                default:
                    System.out.println("Invalid choice, please try again.");
            }
        }
    }
    
    private static void printMenu() {
        System.out.println("Please choose an operation:");
        System.out.println("1. Add phone number");
        System.out.println("2. Delete phone number");
        System.out.println("3. Update phone number");
        System.out.println("4. Search phone number");
        System.out.println("5. Print all phone numbers");
        System.out.println("6. Exit");
    }
    
    private static void addPhoneNumber() {
        System.out.print("Name: ");
        String name = scanner.nextLine();
        System.out.print("Mobile number: ");
        String mobileNumber = scanner.nextLine();
        System.out.print("Fixed number: ");
        String fixedNumber = scanner.nextLine();
        PhoneNumber phoneNumber = new PhoneNumber(name, mobileNumber, fixedNumber);
        phoneNumberManager.addPhoneNumber(phoneNumber);
        System.out.println("Phone number added.");
    }
    
    private static void deletePhoneNumber() {
        System.out.print("Index: ");
        int index = scanner.nextInt();
        scanner.nextLine(); // consume the newline character
        phoneNumberManager.deletePhoneNumber(index);
        System.out.println("Phone number deleted.");
    }
    
    private static void updatePhoneNumber() {
        System.out.print("Index: ");
        int index = scanner.nextInt();
        scanner.nextLine(); // consume the newline character
        System.out.print("New mobile number: ");
        String mobileNumber = scanner.nextLine();
        System.out.print("New fixed number: ");
        String fixedNumber = scanner.nextLine();
        phoneNumberManager.updatePhoneNumber(index, mobileNumber, fixedNumber);
        System.out.println("Phone number updated.");
    }
    
    private static void searchPhoneNumber() {
        System.out.print("Name: ");
        String name = scanner.nextLine();
        PhoneNumber phoneNumber = phoneNumberManager.searchPhoneNumber(name);
        if (phoneNumber == null) {
            System.out.println("Phone number not found.");
        } else {
            System.out.println(phoneNumber);
        }
    }
    
    private static void printAllPhoneNumbers() {
        phoneNumberManager.printAllPhoneNumbers();
    }
}

这个示例代码实现了电话号码查询系统的基本功能，包括添加、删除、修改和查询电话号码，以及打印所有电话号码。您可以根据需要进行修改和扩展。