Java把list分成多个list的方法示例

    private List<List<String>> partition(List<String> originalList, int size) {
        List<List<String>> partition = new ArrayList<>();
        int totalSize = originalList.size();
        // 计算每个集合的大小，向上取整
        int groupSize = (totalSize / size) + 1;

        for (int i = 0; i < size; i++) {
            int start = i * groupSize;
            // 防止数组越界
            int end = Math.min(start + groupSize, totalSize);
            partition.add(new ArrayList<>(originalList.subList(start, end)));
        }
        return partition;
    }

    导入google的guava工具包
    <dependency>
      <groupId>com.google.guava</groupId>
      <artifactId>guava</artifactId>
    </dependency>

    private List<List<String>> partition(List<String> originalList) {
        // 指定数量 -> 每1000个拆分成一个小集合
        List<List<String>> partition = Lists.partition(originalList, 1000);
        return partition;
    }

    private List<List<Integer>> partition() {
        List<Integer> numbers = Arrays.asList(10, 20, 30, 40, 50, 60, 70, 80, 90);
        List<List<Integer>> groups = new ArrayList<>();
        groups.add(new ArrayList<>()); // 小于等于50
        groups.add(new ArrayList<>()); // 大于50

        for (Integer number : numbers) {
            if (number <= 50) {
                groups.get(0).add(number);
            } else {
                groups.get(1).add(number);
            }
        }
        return groups;
    }