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I want to do something like this ArrayList<String<String>> mylist
How can I create it?
How can I add to the external and internal list
and how can I convert the internal list to a simple array list?
509
ArrayList<data_type> list_name = new ArrayList<>(int capacity); The above given is the syntax for array list creation in java, the array list needs to be created with the arraylist keyword as the first item. The array list forms the first item and then the data type of the array list needs to be declared.
int columns = 2; int rows = 2; Here you are using the type String[][] to create a new 2D array with the size defined by [rows][columns] . String[][] newArray = new String[columns][rows]; You assign the values by its placement within the array.
Creating a multidimensional ArrayList often comes up during programming. In many cases, there is a need to create a two-dimensional ArrayList or a three-dimensional ArrayList.
The quickest way I can think of is to use Arrays. fill(Object[], Object) like so, String[][] board1 = new String[10][10]; for (String[] row : board1) { Arrays. fill(row, "-"); } System.
You can go with
List<List<String>> ls2d = new ArrayList<List<String>>(); List<String> x = new ArrayList<String>(); x.add("Hello"); x.add("world!"); ls2d.add(x); System.out.println(Arrays.deepToString(ls2d.toArray())); If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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