The output is NULL...

Question about the task

Notepad for new ideas

Java Syntax, Level 6, Lesson 11

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The task requirements sounds strange.. could please get some hints? Thanks in advance!

1. In the Solution class, create the public static Idea class
2. In the Idea class, declare a public String getDescription() method that returns any non-empty string
3. In the Solution class, create a static public void printIdea(Idea idea) method that will display a description of the idea (what the getDescription method returns)

Requirements:

In the Solution class, create the public static Idea class.
In the Idea class, create the public String getDescription() method.
The getDescription method must return any non-empty string.
In the Solution class, create a public static void printIdea(Idea idea) method.
The printIdea method should display the idea description on the screen.

package com.codegym.task.task06.task0617; /* Notepad for new ideas */ public class Solution { public static void main(String[] args) { printIdea(new Idea()); } //write your code here public static class Idea { public static String description; public String getDescription() { return description; } } public static void printIdea(Idea idea) { System.out.print(Idea.description); } }

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Nouser

Level 36 , Germany

28 October 2020, 12:05

solution

Yes, that's a really confusing task. The idea behind is, to give a static method an argument that is an object reference. This way you can access instance methods from a static context. Line 10 calls the static method and gives it the Idea object as argument. Line 21, the static method... now you have an idea object from type Idea and are able to call instance methods on the reference variable idea or you can call static methods using the class name Idea. However in this example the Idea class does not have and static methods (even if you try to acces one) but only instance methods. Therefore you need to call the getDescription method on the object idea not the class Idea. If you do that, then you access line 16 and in line 17 you return the (static) variable description. Just initialize it as Vincenzo already suggested (or return any string).

Vincenzo Seggio

Level 28

28 October 2020, 10:59

useful

The getDescription method must return any non-empty string. A non-empty string is anything like this: description = "Hi my name is Bryan";.