java - 在 map 中为每个键获取重复值

Question

我正在尝试将所有值放入 map 中，并且我有超过 20k 个值，现在我正在尝试使用想法将值放入 map 中，因为键 1 包含从 1(考虑 i)到 1000(即 i*1000)的值) 但我得到的输出包含重复值(键 1 和 2 具有相同的值)，不确定我在做什么错

这是代码

 public class GetNumbers {

        public static List<String> createList() throws IOException {
            List<String> numbers = new LinkedList<>();
            Path path = null;
            File file = null;
            BufferedReader reader = null;
            String read = "";
            try {
                path = Paths.get("file.txt");
                file = path.toFile();
                reader = new BufferedReader(new FileReader(file));
                while ((read = reader.readLine()) != null) {
                    numbers.add(read);
                }
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
            return numbers;
        }

        public static Map<Integer, List<String>> createNewFiles() throws IOException {
            Map<Integer, List<String>> myMap = new HashMap<>();
            List<String> getList = GetNumbers.createList();
            List<String> list = null;
            int count = getList.size() / 1000;
---------------------------doubt full code-----------------------------------
            for (int i = 1; i <= count; i++) {
                if (getList.size() > 1000) {
                    list = getList.subList(i, i * 1000);
                } else if (getList.size() < 999) {
                    list = getList.subList(i, getList.size());
                }
-----------------------------------------------------------------------------
                myMap.put(i, list);
            }
            return myMap;

        }

        public static void getMap() throws IOException {
            Map<Integer, List<String>> map = GetNumbers.createNewFiles();
            List<String> listAtIndexOne = map.get(2);
            List<String> listAtIndexTwo = map.get(1);
            for (String elementFromFirstList : listAtIndexOne) {
                for (String elementFromSecondList : listAtIndexTwo) {
                    if (elementFromFirstList.equals(elementFromSecondList)) {
                        System.out.println("duplicate copy");
                    }
                }
            }

        }

        public static void main(String[] args) {
            try {
                GetNumbers.getMap();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

编辑

如果我将代码更改为

for (int i = 0; i <= count; i++) {
            if (getList.size() > (i * 1000)) {
                list = getList.subList(i, (i + 1) * 1000);
            } else if (getList.size() < 999) {
                list = getList.subList(i, getList.size());
            }
            myMap.put(i, list);
        }

我得到了

Exception in thread "main" java.lang.IndexOutOfBoundsException: toIndex = 25000 at java.util.SubList.(Unknown Source) at java.util.AbstractList.subList(Unknown Source) at com.dnd.GetNumbers.createNewFiles(GetNumbers.java:43) at com.dnd.GetNumbers.getMap(GetNumbers.java:54) at com.dnd.GetNumbers.main(GetNumbers.java:69)

感谢任何帮助

谢谢

Answer 1

要将列表拆分为 1000 个元素的子列表，您可以这样写:

        for (int i = 1; i <= count; i++) {
            if (getList.size() >= i*1000) {
                list = getList.subList((i-1) * 1000, i * 1000);
            } else {
                list = getList.subList((i-1) * 1000, getList.size());
            }
            myMap.put(i, list);
        }

或更简单:

        for (int i = 1; i <= count; i++) {
            list = getList.subList((i-1) * 1000, Math.min(getList.size(),i * 1000));
            myMap.put(i, list);
        }

请注意，索引是从 0 开始的，因此第一个子列表将从 0 到 999，第二个从 1000 到 1999，依此类推。