各种容器的初始化以及相互初始化

Posted 2021-02-08 keepac

1D-->1D List:

new ArrayList<>(1D_list)

 

1D List添加 2D List 

    List<List<Integer>> result;

     result.add(new ArrayList<>(curResult))

 

set to list;

 new ArrayList < > (map.keySet());