我有點困惑，如果我存盤配方名稱“Tük?rTojás”及其描述，因為即使我通過了添加測驗部分的第一個測驗，當涉及到洗掉部分時，我第一次測驗失敗，我的陣列大小更改為 2，我猜是因為那里的名稱已經定義？我是否必須以某種方式將已定義的名稱存盤到我的陣列串列中？如果我必須這樣做，我應該怎么做？

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);
    }
}

@Test
    public void testDelete() {
        Recipes recipes = new Recipes();

        String name = "Tük?rtojás";

        recipes.add(name, "1. Az olajat egy serpeny?ben kell?képp 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 átsülj?n, a tojásfehérjét egy villa segítségével óvatosan"  
                " megmozgathatjuk.");

        assertEquals(1, recipes.recipes.size()); // The test i fail

        recipes.delete(name);

        assertEquals(0, recipes.recipes.size());
    }
    ```

uj5u.com熱心網友回復：

您需要為 Recipe 創建一個 JavaBean 以將其與 ArrayList 一起使用，因此ArrayList<String>您可能會使用ArrayList<Recipe>.

食譜豆.java

對于這個例子，我將創建一個名為的 JavaBean RecipeBean，它將包含Strings recipeName和recipeDescription

public class RecipeBean {

    private String recipeName = "", recipeDescription = "";

    public RecipeBean() {
    }

    public String getRecipeName() {
        return recipeName;
    }

    public void setRecipeName(String recipeName) {
        this.recipeName = recipeName;
    }

    public String getRecipeDescription() {
        return recipeDescription;
    }

    public void setRecipeDescription(String recipeDescription) {
        this.recipeDescription = recipeDescription;
    }

    public void clear() {
        this.recipeName = "";
        this.recipeDescription = "";
    }
}

上面的類將充當Recipe單個配方的物件或專案。

食譜.java

然后在您的班級中，Recipe.class我將使用而不是宣告ArrayList現在以獲得更多控制權。RecipeBeanString

ArrayList<RecipeBean> recipes = new ArrayList();


import java.util.ArrayList;

public class Recipe {

    /*
    Implement the Recipes class, which handle food recipes (name, description). The class should have an add (add a new recipe)
    */

    ArrayList<RecipeBean> recipes = new ArrayList<>();

    /**
     * Function to add recipe to recipes ArrayList
     *
     * @param recipeName - Recipe Name
     * @param recipeDescription - Recipe Description
     */
    public void addRecipe(final String recipeName, final String recipeDescription) {
    
        System.out.println("Adding recipe : "   recipeName);

        RecipeBean recipeBean = new RecipeBean();

        recipeBean.setRecipeName(recipeName); // Set recipeName to JavaBean
        recipeBean.setRecipeDescription(recipeDescription); // Set recipeDescription to JavaBean

        // Check if ArrayList is null
        if (recipes != null) {
            recipes.add(recipeBean); // Add java bean to ArrayList
        }
    }

    /**
     * Function to delete recipe to recipes ArrayList
     *
     * @param recipeName - Recipe Name
     */
    public void deleteRecipe(final String recipeName) {

        System.out.println("Deleting recipe : "   recipeName);

        // Check if ArrayList is null
        if (recipes != null) {

            // Loop through ArrayList and remove current object if name matches passed parameter
            recipes.removeIf(recipe -> recipe.getRecipeName().equalsIgnoreCase(recipeName));
        }
    }
}

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