如何在 Java 中制作任务和待办事项程序？

Question

我想制作一个任务和待办事项程序。我把代码写在了分开的类中。 class Task 将代表需要完成的单个项目。

public class Task {
private String task;
private int priority;
private int workload;

public Task(String task, int priority, int workload) {
    this.task = task; // Description of the task
    this.priority = priority; // 1 = very important, 2 = important, 3 = unimportant, 4 = after learn
                              // Portuguese
    this.workload = workload; // amount of time to complete the task
}

public String getPriority(String translation) {
    if (priority == 1) {
        translation = "very important";
    }
    if (priority == 2) {
        translation = " important";
    }
    if (priority == 3) {
        translation = "unimportant";
    }
    if (priority == 4) {
        translation = " after learn German";
    }
    return translation;
}

public String toString() {
    String translation = "";
    return task + " takes " + workload + " minutes and has priority " + getPriority(translation);
}
}

而 class Todo 将组织所有任务。

public class Todo {
ArrayList<String> Todo = new ArrayList<>();

public void addTask(String description, int priority, int minutes) {
    if (priority > 4 || priority < 1) {
        System.out.println(description + " has invalid priority ");
    }
    if (minutes < 0) {
        System.out.println(description + " has invalid workload ");
    }
    Todo.add(Task.class.getName());
}

public void getTodoList() {
    Todo.forEach(item->System.out.println(Task.class.getName().toString()));
}

public void print() {
    System.out.println("Todo:");
    System.out.println("-----");
    getTodoList();
    if (Todo == null) {
        System.out.println("You're all done for today! #TodoZero");
    }
}

public static void main(String[] args) {
    Task task;
    Todo todo;
    todo = new Todo();
    todo.addTask("Go to gym", 2, 60);
    todo.addTask("Read book", 1, 45);
    todo.print();
    System.out.print("");
}
}

输出：

Todo:
-----
Task
Task

但问题是 Todo.print() method 无法打印已添加到 Todo 的任务列表。预期的输出应该是这样的：

Go to gym takes 60 minutes and has priority important
Read book takes 45 minutes and has priority very important

Answer 1

你的输出是正确的。您没有将任务添加到列表中，而是添加了 class 名称。在 todo.add()

中调用 Task 的构造函数

Answer 2

您的 Todo 中需要进行以下更改 Class 以获得所需的输出

   ArrayList<Task> Todo = new ArrayList<>(); // ArrayList of Tasks

     public void addTask(String description, int priority, int minutes) {
          if (priority > 4 || priority < 1) {
             System.out.println(description + " has invalid priority ");
          }

          if (minutes < 0) {
             System.out.println(description + " has invalid workload ");
         }
         Todo.add(new Task(description, priority,minutes));   // Add Task
     }

     
     public void getTodoList() {
        // Iterate over Todo ArrayList
         for (Task task : Todo){
               System.out.println(task);
            }
     }

如何在 Java 中制作任务和待办事项程序？

How to make a Task and Todo Program in Java?

java

interface

class

tostring

extend