Varga Gergő

So i think i did it? This is the first time I ever heard of List.of ,  I'm not sure if I was supposed to fill the empty spaces. Also I'm not sure where should i have used get,

import org.junit.Test; // *** add appropriate import statements here *** import java.util.ArrayList; import java.util.Collections; import java.util.List; import static org.junit.Assert.*; public class WorkingWithListsTest {    @Test    public void should_know_how_declare_a_List_variable() {        // Task 1:        // Make appropriate changes to the declaration below        // to make this test pass. myList should be able to hold        // any kind of object.        List<Object> myList = new ArrayList<>();        // do NOT change any of the lines below        myList.add(new Object());        myList.add(1);        myList.add("foo");        assertTrue(List.class.isAssignableFrom(myList.getClass()));        assertEquals(3, myList.size());    }    @Test    public void should_know_how_to_create_an_empty_List() {        // Task 2:        // Change the line below to make this test pass        List<Object> myList = Collections.emptyList();        // do NOT change any of the lines below        assertTrue(List.class.isAssignableFrom(myList.getClass()));        assertTrue(myList.isEmpty());    }    @Test    public void should_know_how_to_use_List_of_and_access_specific_elements() {        // Task 3:        // Modify the next 4 statements to use List.of() and List.get()        // and make this test pass.        String first = "hey";        String third = "friend";        String last = "you did it!";        List<String> myList = List.of(first,"second",third,"4th",last);        // bonus: change the line below to make the last assert statement pass        int numberOfElements = myList.size();        // do NOT change any of the lines below        String[] elements = myList.toArray(new String[0]);        assertEquals(5, elements.length);        assertEquals("hey", first);        assertEquals(elements[0], first);        assertEquals("friend", third);        assertEquals(elements[2], third);        assertEquals("you did it!", last);        assertEquals(elements[elements.length-1], last);        assertEquals(elements.length, numberOfElements);    } }

Okay! I will probably do it today

I would like to thank everyone, for the help, comments, and the Docs, they are really helpfull, and im really happy , that i found and joined this community. I wasnt expecting , so much help and so many friendly people! I will try to learn a lot this week because my exam got , delayed for the next week, because our teacher , wants us to learn both the basics of File manangment , and Inheritence , I will, see how well i understand it , in the lesson , but i will definetly look through the site for more docs etc

Wow! Thanks for the detalied answer , i never knew this could be such a huge deal. I will try to learn OOP in my self then. Luckily i only have to spend this semester , with this Prof. I always thought test cases like that are really good since i never had them in my other classes before.

Junilu Lacar wrote:

Carey Brown wrote:You'd have
List<String[]> recipes = new ArrayList<>();Where each entry is a String array of size 2.

@OP: Do you understand the reasons for this? What would you say if your professor asked you to explain this?

Hey, there excuse me , for the late reply, I' had to go, I dont really understand, we just started to learn the bacics of OOP ,and lists etc, I assume that this is a list , which stores a 2 element String arrays, i just dont know how to store them into the array and pass that string array to the List. Also , i emailed my prof yesterday, about the Map solution, and she said she can accept it , and i should just ignore the tests. I truly whish that she would have said that sooner. If you dont mind me asking , how should i fill that List? in the add method

So i assume , i must chnage my add method as well, and i must get rid of the Maps, if have to do the add method again, i have to use a String[] array or an ArrayList

All the assets equals were made by my prof :/
Thats why  i used Array list at the first time,
I thought its cam be done with Maps, i have no idea , how could i do it with Arrays

I tried to do that , but it didnt worked
Im supposed to make a moethod called   getItems which returns the details of actually stored recipes as a String method.
So i assume i need to return the Map somehow?

This is what the last test checks
public void testGetItems() {        Recipes recipes = new Recipes();        String name = "Tükörtojás";        String description = "1. Az olajat egy serpenyőben kellőképp felforrósítjuk és óvatosan beleütjük" +                " a tojásokat.\r\n2. Keverés nélkül készre sütjük, míg a tojásfehérje megsül, de a sárgája" +                " folyós marad.\r\n3. Hogy jobban átsüljön, a tojásfehérjét egy villa segítségével óvatosan" +                " megmozgathatjuk.";        recipes.add(name, description);        assertEquals(1, recipes.getItems().size());        assertEquals(name, recipes.getItems().get(0)[0]);        assertEquals(description, recipes.getItems().get(0)[1]);    }

Thank You for the answer
I tried it with, the maps, im able  to pass the two test, but , im not sure how should i start the 3rd part ,
"getItems (return the details of actually stored recipes as a String) method."

Hey There , Im pretty new to this site and , i hope im making this post right

I will have an exam this week and im practicng for it

Here is the task I have to do :
Implement the Recipes class, which handle food recipes (name, description). The class should have an add (add a new recipe), a delete (delete the given item), and a getItems (return the details of actually stored recipes as a String) method.





Here is the test file we were given by default, we have to pass all the test parts
import org.junit.Test; import static org.junit.Assert.assertEquals; public class RecipesTest {    //TODO Before doing Task 2 remove "/*" and "*/" (Shortcut: Ctrl + Shift + /).    @Test    public void testAdd() {        Recipes recipes = new Recipes();        assertEquals(0, recipes.recipes.size());        recipes.add("Tükörtojás", "1. Az olajat egy serpenyőben kellőképp felforrósítjuk és óvatosan beleütjük" +                " a tojásokat.\r\n2. Keverés nélkül készre sütjük, míg a tojásfehérje megsül, de a sárgája" +                " folyós marad.\r\n3. Hogy jobban átsüljön, a tojásfehérjét egy villa segítségével óvatosan" +                " megmozgathatjuk.");        assertEquals(1, recipes.recipes.size());    }    @Test    public void testDelete() {        Recipes recipes = new Recipes();        String name = "Tükörtojás";        recipes.add(name, "1. Az olajat egy serpenyőben kellőképp felforrósítjuk és óvatosan beleütjük" +                " a tojásokat.\r\n2. Keverés nélkül készre sütjük, míg a tojásfehérje megsül, de a sárgája" +                " folyós marad.\r\n3. Hogy jobban átsüljön, a tojásfehérjét egy villa segítségével óvatosan" +                " megmozgathatjuk.");        assertEquals(1, recipes.recipes.size()); // The test i fail        recipes.delete(name);        assertEquals(0, recipes.recipes.size());    }    @Test    public void testGetItems() {        Recipes recipes = new Recipes();        String name = "Tükörtojás";        String description = "1. Az olajat egy serpenyőben kellőképp felforrósítjuk és óvatosan beleütjük" +                " a tojásokat.\r\n2. Keverés nélkül készre sütjük, míg a tojásfehérje megsül, de a sárgája" +                " folyós marad.\r\n3. Hogy jobban átsüljön, a tojásfehérjét egy villa segítségével óvatosan" +                " megmozgathatjuk.";        recipes.add(name, description);        assertEquals(1, recipes.getItems().size());        assertEquals(name, recipes.getItems().get(0)[0]);        assertEquals(description, recipes.getItems().get(0)[1]);    } }


My biggest problem is , that I' have no idea , how to store the recepies and names, i spent my whole day trying to create the (add a new recipe part ) but , i failed . I tried many option, but in every scenario, i either go over the expected size , or i dont store any data, Im not even sure, if my array type is should be String

public class Recipes { /* Implement the Recipes class, which handle food recipes (name, description). The class should have an add (add a new recipe), */    ArrayList<String> recipes = new ArrayList<>();    public void add(String name, String desc)    {   Collections.addAll(recipes,name,desc);        System.out.println(recipes.get(0));        System.out.println(recipes.get(1));    }    public void delete(String name)    {          recipes.remove(name);    } }
If anyone can help a little , i would be really thankfull