有没有一种方法可以在Java中将2维数组添加到2维数组列表中？

Question

I know how to add a one dimmensional array to a one dimmensional array list ie

 ArrayList<Integer> arrayList = new ArrayList<Integer>  
 (Arrays.asList(array));

However,I'm not sure what needs to be done to add a two dimmensional array to a two dimmensional array list .Below posted is the code.

 int[][] myPoints = {{2,3},{4,5},{7,8},{9,10}};

 ArrayList<Integer> arrayList = new ArrayList<Integer>
 (Arrays.asList(myPoints));????

Answer 1

If you want to preserve one-dimensional arrays from int[][] it's basically:

ArrayList<int[]> arrOfArr = new ArrayList<int[]>();
int[][] myPoints = {{2,3},{4,5},{7,8},{9,10}};

arrOfArr.addAll(Arrays.asList(myPoints)); // here's the one-liner doing the job

And if you want to flatten your 2D array to list of integers there's no other way than do it manually by iterating over every element of your array. Which, I suppose, you can.

Answer 2

If Java 8 is an option for you, you could use the Stream API to accomplish what you want in one line:

int[][] myPoints = {{2,3},{4,5},{7,8},{9,10}};
List<List<Integer>> myPointsAsList = 
    Stream.of(myPoints).map(point -> Arrays.asList(point))
    .collect(Collectors.toList());