Question

我已经编写了以下代码行，似乎一切正常，但是当我看到结果不正确时。

在这里，我定义了一个LinkedList并在其中添加了一个对象。

private LinkedList<KategoriRecipeList> createListObjects() {

        LinkedList<KategoriRecipeList> list = new LinkedList<KategoriRecipeList>();
        KategoriRecipeList kategori = new KategoriRecipeList();

        for(int i=0; i<resepi.getResepiId().size(); i++) {
            kategori.setKategoriName(kategoriName);
            kategori.setResepiId(resepi.getResepiId().get(i));
            kategori.setResepiName(resepi.getResepiName().get(i).trim().replaceAll("'", ""));
            kategori.setImgLogoUri(resepi.getResepiImageURL().get(i));
            kategori.setImgMoreUri(bitmapUrls.get(i));

            Log.i("WWWWWWW", "Recipe '" + resepi.getResepiName().get(i) + "' added to list");

            list.add(kategori);
        }

        return list;
    }

当我看到日志文件时，结果如下：

09-09 03:05:29.272: I/WWWWWWW(1250): Recipe '"Chicken Cordon Bleu"' added to list

09-09 03:05:29.272: I/WWWWWWW(1250): Recipe '"Sat-Bag"' added to list

09-09 03:05:29.272: I/WWWWWWW(1250): Recipe 'Ayam Adobo ' added to list

09-09 03:05:29.272: I/WWWWWWW(1250): Recipe 'Ayam Ber’Crumble’ & ‘Fennel’ direneh Air Roselle' added to list

09-09 03:05:29.272: I/WWWWWWW(1250): Recipe 'Ayam Dua Cara' added to list

我有另一种调用上述方法的方法：

private void storeListIntoDatabase() {
        Log.i(TAG, "Try to insert data into database.");

        LinkedList<KategoriRecipeList> listOfObjects = createListObjects();
        if(listOfObjects == null  ||  listOfObjects.size() <= 0)
            return;

        for(int i=0;  i<listOfObjects.size(); i++)
            Log.i("KKKKKKKK", "Recipe '" + listOfObjects.get(i).getResepiName() + "' added to list");
    }

日志文件中的结果如下：

09-09 03:05:29.297: I/KKKKKKKK(1250): Recipe 'Tongkeng Ayam Goreng dan Nasi Kari Leher Ayam' added to list

09-09 03:05:29.297: I/KKKKKKKK(1250): Recipe 'Tongkeng Ayam Goreng dan Nasi Kari Leher Ayam' added to list

09-09 03:05:29.297: I/KKKKKKKK(1250): Recipe 'Tongkeng Ayam Goreng dan Nasi Kari Leher Ayam' added to list

09-09 03:05:29.297: I/KKKKKKKK(1250): Recipe 'Tongkeng Ayam Goreng dan Nasi Kari Leher Ayam' added to list

09-09 03:05:29.297: I/KKKKKKKK(1250): Recipe 'Tongkeng Ayam Goreng dan Nasi Kari Leher Ayam' added to list

正如您所看到的结果不同但我希望结果应该相同。我的问题在哪里？感谢

Answer 1

您需要在每个循环上创建新实例，否则将更新相同的实例。列表维护对象的引用，它们不包含对象的副本。

for(int i=0; i<resepi.getResepiId().size(); i++) {
    KategoriRecipeList kategori = new KategoriRecipeList();
    kategori.setKategoriName(kategoriName);
    kategori.setResepiId(resepi.getResepiId().get(i));
    ....
}

Answer 2

这一行

KategoriRecipeList kategori = new KategoriRecipeList（）;

需要在for循环中你必须每次都创建一个新对象

Java，如何将对象添加到LinkedList中？

2 个答案: