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我对arraylist有一个奇怪的问题。我在for循环中将对象添加到arraylist，除了arraylist add方法外一切正常。似乎我的列表将每个对象添加了两次，但我找不到原因。这是我的代码

private void generateCitizens()
{
    int counter = Constants.CITIZENS_NUMBER;
    Random r = new Random(Calendar.getInstance().getTimeInMillis());
    while(counter > 0)
    {
        int x = r.nextInt(Constants.TILES_IN_WIDTH) + 1;
        int y = r.nextInt(Constants.TILES_IN_HEIGHT) + 1;

        if(map.collisionTable[y][x] == 2)
        {
            Citizen c = new Citizen(x, y, citizenTexture.deepCopy(), map);
            citizensList.add(c);
            Log.i("Citizens count", String.valueOf(citizensList.size()));
            scene.attachChild(c);
            counter--;
        }
    }

    for(int i = 0; i<citizensList.size(); i++)
    {
        Log.i("Citizen - ", citizensList.get(i).toString());
    }
}

在这种情况下，Constants.CITIZENS_NUMBER 是 15，这就是我在日志中得到的

05-10 15:13:36.801: I/Citizens count(3237): 2 05-10 15:13:36.801: I/Citizens count(3237): 4 05-10 15:13:36.801: I/Citizens count( 3237): 6 05-10 15:13:36.801: I/Citizens count(3237): 8 05-10 15:13:36.801: I/Citizens count(3237): 10 05-10 15:13:36.811: I /公民人数(3237): 12 05-10 15:13:36.811: 我/公民人数(3237): 14 05-10 15:13:36.811: 我/公民人数(3237): 16 05-10 15:13 :36.811: I/Citizens count(3237): 18 05-10 15:13:36.821: I/Citizens count(3237): 20 05-10 15:13:36.821: I/Citizens count(3237): 22 05- 10 15:13:36.821: I/Citizens count(3237): 24 05-10 15:13:36.821: I/Citizens count(3237): 26 05-10 15:13:36.831: I/Citizens count(3237) : 28 05-10 15:13:36.831: I/Citizens count(3237): 30 05-10 15:13:36.831: I/Citizen -(3237): com.lpp.towndefence.Citizen@40535d40 05-10 15 :13:36.831: I/Citizen -(3237): com.lpp。towndefence.Citizen@40535d40 05-10 15:13:36.831: I/Citizen -(3237): com.lpp.towndefence.Citizen@40537318 05-10 15:13:36.831: I/Citizen -(3237): com. lpp.towndefence.Citizen@40537318 05-10 15:13:36.841: I/Citizen -(3237): com.lpp.towndefence.Citizen@40514688 05-10 15:13:36.841: I/Citizen -(3237): com.lpp.towndefence.Citizen@40514688 05-10 15:13:36.841: I/Citizen -(3237): com.lpp.towndefence.Citizen@40799fe8 05-10 15:13:36.841: I/Citizen -(3237) ): com.lpp.towndefence.Citizen@40799fe8 05-10 15:13:36.841: I/Citizen -(3237): com.lpp.towndefence.Citizen@4079c308 05-10 15:13:36.841: I/Citizen - (3237): com.lpp.towndefence.Citizen@4079c308 05-10 15:13:36.841: I/Citizen -(3237): com.lpp.towndefence.Citizen@4079abd8 05-10 15:13:36.841: I/公民-（3237）：com.lpp.towndefence.Citizen@4079abd8 05-10 15：13：36.841：我/公民-（3237）：com.lpp。towndefence.Citizen@4079b4a0 05-10 15:13:36.841: I/Citizen -(3237): com.lpp.towndefence.Citizen@4079b4a0 05-10 15:13:36.841: I/Citizen -(3237): com. lpp.towndefence.Citizen@407ba160 05-10 15:13:36.841: I/Citizen -(3237): com.lpp.towndefence.Citizen@407ba160 05-10 15:13:36.841: I/Citizen -(3237): com.lpp.towndefence.Citizen@407ba230 05-10 15:13:36.851: I/Citizen -(3237): com.lpp.towndefence.Citizen@407ba230 05-10 15:13:36.851: I/Citizen -(3237) ): com.lpp.towndefence.Citizen@407ba300 05-10 15:13:36.861: I/Citizen -(3237): com.lpp.towndefence.Citizen@407ba300 05-10 15:13:36.861: I/Citizen - (3237): com.lpp.towndefence.Citizen@407ba3d0 05-10 15:13:36.861: I/Citizen -(3237): com.lpp.towndefence.Citizen@407ba3d0 05-10 15:13:36.861: I/公民-（3237）：com.lpp.towndefence.Citizen@407ba4a0 05-10 15：13：36.861：我/公民-（3237）：com.lpp。towndefence.Citizen@407ba4a0 05-10 15:13:36.861: I/Citizen -(3237): com.lpp.towndefence.Citizen@407bac18 05-10 15:13:36.861: I/Citizen -(3237): com. lpp.towndefence.Citizen@407bac18 05-10 15:13:36.871: I/Citizen -(3237): com.lpp.towndefence.Citizen@407bb3f0 05-10 15:13:36.871: I/Citizen -(3237): com.lpp.towndefence.Citizen@407bb3f0 05-10 15:13:36.871: I/Citizen -(3237): com.lpp.towndefence.Citizen@407bbc80 05-10 15:13:36.871: I/Citizen -(3237) ): com.lpp.towndefence.Citizen@407bbc80I/Citizen -(3237): com.lpp.towndefence.Citizen@407bbc80 05-10 15:13:36.871: I/Citizen -(3237): com.lpp.towndefence.Citizen@407bbc80I/Citizen -(3237): com.lpp.towndefence.Citizen@407bbc80 05-10 15:13:36.871: I/Citizen -(3237): com.lpp.towndefence.Citizen@407bbc80

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1 回答 1

1

你把这个类子List类化了吗？

可以new Citizen将自己添加到列表中吗？还是attachChild现场方法？

于 2012-05-10T13:31:41.620 回答