public class Project {
    private String name;
    private String description;
    private String startDate;
    private String endDate;
    private List<Task> tasks;

    // 構(gòu)造函數(shù)、getter/setter 方法
}

public class Task {
    private String title;
    private String assignee;
    private String status; // 如: "未開(kāi)始", "進(jìn)行中", "已完成"

    // 構(gòu)造函數(shù)、getter/setter 方法
}

public class ProjectManager {
    private List<Project> projects = new ArrayList<>();

    public void addProject(Project project) { ... }
    public void addTaskToProject(String projectName, Task task) { ... }
    public void updateTaskStatus(String projectName, String taskTitle, String status) { ... }
    public void displayAllProjects() { ... }
}

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        ProjectManager pm = new ProjectManager();

        while (true) {
            System.out.println("\n1. 創(chuàng)建項(xiàng)目  2. 添加任務(wù)  3. 更新任務(wù)狀態(tài)  4. 查看所有項(xiàng)目  5. 退出");
            System.out.print("請(qǐng)選擇操作：");
            int choice = scanner.nextInt();
            scanner.nextLine(); // 消費(fèi)換行符

            switch (choice) {
                case 1:
                    // 輸入項(xiàng)目信息并創(chuàng)建
                    break;
                case 2:
                    // 添加任務(wù)到指定項(xiàng)目
                    break;
                case 3:
                    // 更新任務(wù)狀態(tài)
                    break;
                case 4:
                    pm.displayAllProjects();
                    break;
                case 5:
                    System.out.println("退出系統(tǒng)。");
                    return;
                default:
                    System.out.println("無(wú)效選擇，請(qǐng)重試。");
            }
        }
    }
}

Gson gson = new GsonBuilder().setPrettyPrinting().create();
try (FileWriter writer = new FileWriter("projects.json")) {
    gson.toJson(projects, writer);
}