Java里如何开发个人任务清单工具_任务清单项目实战解析

public class Task {
    private int id;
    private String title;
    private String description;
    private String dueDate;
    private boolean completed;
<pre class='brush:java;toolbar:false;'>public Task(int id, String title, String description, String dueDate) {
    this.id = id;
    this.title = title;
    this.description = description;
    this.dueDate = dueDate;
    this.completed = false;
}

// Getter 和 Setter 方法
public int getId() { return id; }
public String getTitle() { return title; }
public boolean isCompleted() { return completed; }
public void markCompleted() { this.completed = true; }

@Override
public String toString() {
    return "ID:" + id + " | " + title + " | " + dueDate + 
           " | " + (completed ? "已完成" : "未完成");
}

import java.io.*;
import java.util.*;
<p>public class TaskManager {
private List<Task> tasks;
private static final String FILE_NAME = "tasks.txt";
private int nextId = 1;</p><pre class='brush:java;toolbar:false;'>public TaskManager() {
    tasks = new ArrayList<>();
    loadFromFile();
}

public void addTask(String title, String description, String dueDate) {
    Task task = new Task(nextId++, title, description, dueDate);
    tasks.add(task);
    System.out.println("任务已添加：" + task.getTitle());
}

public void viewTasks() {
    if (tasks.isEmpty()) {
        System.out.println("暂无任务。");
        return;
    }
    for (Task task : tasks) {
        System.out.println(task);
    }
}

public void markTaskAsCompleted(int id) {
    for (Task task : tasks) {
        if (task.getId() == id) {
            task.markCompleted();
            System.out.println("任务已标记为完成：" + task.getTitle());
            return;
        }
    }
    System.out.println("未找到ID为 " + id + " 的任务。");
}

public void deleteTask(int id) {
    tasks.removeIf(task -> task.getId() == id);
    System.out.println("已删除ID为 " + id + " 的任务。");
}

    private void loadFromFile() {
        File file = new File(FILE_NAME);
        if (!file.exists()) return;
<pre class='brush:java;toolbar:false;'>    try (BufferedReader br = new BufferedReader(new FileReader(file))) {
        String line;
        while ((line = br.readLine()) != null) {
            String[] parts = line.split(",");
            if (parts.length == 5) {
                Task task = new Task(
                    Integer.parseInt(parts[0]),
                    parts[1], parts[2], parts[3]
                );
                if ("true".equals(parts[4])) {
                    task.markCompleted();
                }
                tasks.add(task);
                nextId = Math.max(nextId, task.getId() + 1);
            }
        }
    } catch (IOException e) {
        System.out.println("读取文件失败：" + e.getMessage());
    }
}

private void saveToFile() {
    try (PrintWriter pw = new PrintWriter(new FileWriter(FILE_NAME))) {
        for (Task task : tasks) {
            pw.println(task.getId() + "," +
                       task.getTitle() + "," +
                       task.getDescription() + "," +
                       task.getDueDate() + "," +
                       task.isCompleted());
        }
    } catch (IOException e) {
        System.out.println("保存文件失败：" + e.getMessage());
    }
}

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        TaskManager manager = new TaskManager();
<pre class='brush:java;toolbar:false;'>    while (true) {
        System.out.println("\n--- 个人任务清单 ---");
        System.out.println("1. 添加任务");
        System.out.println("2. 查看所有任务");
        System.out.println("3. 标记任务完成");
        System.out.println("4. 删除任务");
        System.out.println("5. 退出");
        System.out.print("请选择操作：");

        int choice = scanner.nextInt();
        scanner.nextLine(); // 消费换行符

        switch (choice) {
            case 1:
                System.out.print("任务标题：");
                String title = scanner.nextLine();
                System.out.print("描述：");
                String desc = scanner.nextLine();
                System.out.print("截止日期（YYYY-MM-DD）：");
                String date = scanner.nextLine();
                manager.addTask(title, desc, date);
                break;
            case 2:
                manager.viewTasks();
                break;
            case 3:
                System.out.print("请输入要完成的任务ID：");
                int id = scanner.nextInt();
                manager.markTaskAsCompleted(id);
                break;
            case 4:
                System.out.print("请输入要删除的任务ID：");
                int delId = scanner.nextInt();
                manager.deleteTask(delId);
                break;
            case 5:
                manager.saveToFile();
                System.out.println("数据已保存，程序退出。");
                return;
            default:
                System.out.println("无效选择，请重试。");
        }
    }
}