java中将List数据平均切分成N份

发布于:2023-09-16 ⋅ 阅读:(67) ⋅ 点赞:(0)

话不多说,直接上代码,直接用

  public static <T> List<List<T>> averageList(List<T> source, int n) {
    List<List<T>> ret = new ArrayList<List<T>>();
    int number = source.size() / n;
    int remainder = source.size() % n; // 取余
    int offset = 0;//偏移量
    for (int i = 0; i < n; i++) {
      System.out.println("i:"+i);
      List<T> value = null;
      if (remainder > 0) {
        value = source.subList(i * number + offset, (i + 1) * number + offset + 1);
        remainder--;
        offset++;
      } else {
        value = source.subList(i * number + offset, (i + 1) * number + offset);
      }
      ret.add(value);
    }
    return ret;
  }

如果想要再去除这里面存在的多余的空list,就加这行代码:

  public static <T> List<List<T>> removeEmptyList(List<T> source, int n){
    List<List<T>> lists = averageList(source, n);
    return lists.stream().filter(i -> i.size() != 0).collect(Collectors.toList());
  }
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