Question

Hello again stackoverflow,
I have a question concerning List of Objects.

I have tried out writing some things, but can’t find it though.
How do I find an Object in a list of objects, when these objects are lists of its own?

this is what i have so far:

Recipe is a List of: {modification[], ingredients[], recipeBookName, recipeName}

public void removeFromBook(Recipe recipeName) {
    recipes = getRecipes();
    emptyRecipe = getEmptyPage(recipeBookName);

Now, I want to replace a Recipe which has a recipeName, by the emptyRecipe.
I think it will be something like:

for(r in recipes) {
    if(r.recipeName == recipeName) {
        list.replace(Recipe, emptyRecipe)
    } else {

    }
}

any ideas? 🙂

here’s my constructor for the Recipe class:

    public String[] modifications;
public String[] ingredients;
public String recipeName;
public String partOfRecipeBook;

public Recipe(String recipeName, String[] modifications, String[] ingredients, String recipeBookName){
    setRecipeModifications(modifications);
    setRecipeIngredients(ingredients);
    setRecipeName(recipeName);
    setRecipeBookName(recipeBookName);
}

Answer 1

Using a List with Objects in it (of which some are arrays) is not the best way it would be better to define a new object Recipe and use that.

public class Recipe {
    private List<Ingredient> ingredients;
    private List<Modification> modifications;
    private String bookName;
    private String book;
}

Then replacing in ingredients is a lot simpler. e.g. give recipe a function like

public void replaceIngredent(Ingredient oldIngredient, Ingredient newIngredient) {
    int index = ingredients.indexOf(oldIngredient);
    if (index != -1) {
        ingredients.remove(index);
        ingredients.add(index, newIngredient);
    }
}