Java实现任务列表功能全解析

public class Task {
    private int id;
    private String title;
    private String description;
    private int priority; // 1:高, 2:中, 3:低
    private boolean completed;
    private long createdAt;

    public Task(int id, String title, String description, int priority) {
        this.id = id;
        this.title = title;
        this.description = description;
        this.priority = priority;
        this.completed = false;
        this.createdAt = System.currentTimeMillis();
    }

    // Getter 和 Setter 方法省略，实际开发中需补全
}

import java.util.*;

public class TaskService {
    private List tasks = new ArrayList();
    private int nextId = 1;

    public void addTask(String title, String description, int priority) {
        Task task = new Task(nextId++, title, description, priority);
        tasks.add(task);
    }

    public List getAllTasks() {
        return new ArrayList(tasks);
    }

    public void markCompleted(int id) {
        for (Task task : tasks) {
            if (task.getId() == id) {
                task.setCompleted(true);
                break;
            }
        }
    }

    public void removeTask(int id) {
        tasks.removeIf(task -> task.getId() == id);
    }

    public List getTasksSortedByPriority() {
        List sorted = new ArrayList(tasks);
        sorted.sort(Comparator.comparingInt(Task::getPriority));
        return sorted;
    }
}