110 lines
3.9 KiB
Java
110 lines
3.9 KiB
Java
package TodoListApp;
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import java.util.Scanner;
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// 主类
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public class TodoListApp {
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private static final String ADD_TODO = "1";
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private static final String LIST_TODOS = "2";
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private static final String REMOVE_TODO = "3";
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private static final String MARK_AS_COMPLETED = "4";
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private static final String SAVE_TODOS = "5";
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private static final String EXIT = "6";
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private static final TodoListManager manager = new TodoListManager();
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private static final Scanner scanner = new Scanner(System.in);
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public static void main(String[] args) {
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boolean exit = false;
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while (!exit) {
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printMenu();
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String choice = scanner.nextLine();
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switch (choice) {
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case ADD_TODO:
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addTodoUI();
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break;
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case LIST_TODOS:
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manager.listTodos();
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break;
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case REMOVE_TODO:
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removeTodoUI();
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break;
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case MARK_AS_COMPLETED:
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markAsCompletedUI();
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break;
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case SAVE_TODOS:
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manager.saveToFile("todos.dat");
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break;
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case EXIT:
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exit = true;
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System.out.println("退出程序。");
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break;
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default:
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System.out.println("无效的选择，请重新输入。");
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}
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}
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scanner.close();
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}
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// 打印菜单
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private static void printMenu() {
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System.out.println("\n===== 简易待办事项管理器 =====");
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System.out.println("1. 添加待办事项");
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System.out.println("2. 查看所有待办事项");
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System.out.println("3. 删除待办事项");
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System.out.println("4. 标记待办为已完成");
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System.out.println("5. 保存待办事项（字节流）");
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System.out.println("6. 退出");
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System.out.print("请选择操作（1-6）：");
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}
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// 添加待办事项的用户界面
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private static void addTodoUI() {
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String description = getNonEmptyInput("请输入待办事项描述：");
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try {
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manager.addTodo(description);
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} catch (EmptyDescriptionException e) {
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System.out.println("自定义异常：" + e.getMessage());
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}
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}
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// 删除待办事项的用户界面
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private static void removeTodoUI() {
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System.out.print("请输入要删除的待办事项编号：");
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String input = scanner.nextLine().trim();
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try {
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int id = Integer.parseInt(input);
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manager.removeTodo(id);
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} catch (NumberFormatException e) {
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try {
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throw new InvalidIdException("请输入有效的ID编号。");
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} catch (InvalidIdException ex) {
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System.out.println("自定义异常：" + ex.getMessage());
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;
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}
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} catch (TodoNotFoundException e) {
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System.out.println("自定义异常：" + e.getMessage());
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}
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}
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//用于对用户的输入进行提示和预处理的能用方法
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private static String getNonEmptyInput(String prompt) {
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System.out.println(prompt);
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String input = scanner.nextLine().trim();
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while (input.isEmpty()) {
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System.out.println("输入不能为空，请重新输入。");
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System.out.println(prompt);
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input = scanner.nextLine().trim();
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}
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return input;
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}
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private static void markAsCompletedUI() {
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String input = getNonEmptyInput("请输入要标记为已完成的待办事项编号：");
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try {
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int id = Integer.parseInt(input);
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manager.markAsCompleted(id);
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} catch (NumberFormatException e) {
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System.out.println("请输入有效的数字编号。");
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}
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}
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} |