How to create an 2D ArrayList in java

Question

I want to create a 2D array that each cell is an ArrayList   I consider this defintions  but I can not add anything to them are these defintions true    ArrayList lt ArrayList lt String gt  gt  table   new ArrayList lt ArrayList lt String gt  gt       or   ArrayList     table   new ArrayList 10  10      table add         Please help me

User · Answer

The best way is to use a List within a List   List lt List lt String gt  gt  listOfLists   new ArrayList lt List lt String gt  gt

User · Answer

ArrayList lt String gt      list   new ArrayList 10  10   list 0  0    new ArrayList lt  gt     list 0  0  add  test

User · Answer

1st of all  when you declare a variable in java  you should declare it using Interfaces even if you specify the implementation when instantiating it  ArrayList lt ArrayList lt String gt  gt  listOfLists   new ArrayList lt ArrayList lt String gt  gt       should be written  List lt List lt String gt  gt  listOfLists   new ArrayList lt List lt String gt  gt  size      Then you will have to instantiate all columns of your 2d array      for int i   0  i  lt  size  i               listOfLists add new ArrayList lt String gt              And you will use it like this    listOfLists get 0  add  foobar      But if you really want to  create a 2D array that each cell is an ArrayList    Then you must go the dijkstra way

User · Answer

This can be achieve by creating object of List data structure  as follows  List list   new ArrayList     For more information refer this link  How to create a Multidimensional ArrayList in Java

User · Answer

I want to create a 2D array that each cell is an ArrayList   If you want to create a 2D array of ArrayList Then you can do this    ArrayList     table   new ArrayList 10  10   table 0  0    new ArrayList       add another ArrayList object to  0 0  table 0  0  add       add object to that ArrayList

[java] How to create an 2D ArrayList in java?

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