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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<ArrayList<String>> table = new ArrayList<ArrayList<String>>(); or
ArrayList[][] table = new ArrayList[10][10]; //table.add?????? Please help me
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A simple solution is to use the clone() method to clone a 2-dimensional array in Java. The following solution uses a for loop to iterate over each row of the original array and then calls the clone() method to copy each row.
The next method to produce a 2D list in Java is to create an ArrayList of ArrayLists; it will serve our purpose as it will be two-dimensional. To insert an innerArraylist function inside outerArrayList1 , we can initialize the 2D ArrayList Java object to outerArrayList1 .
An Iterator can be used to loop through an ArrayList. The method hasNext( ) returns true if there are more elements in ArrayList and false otherwise. The method next( ) returns the next element in the ArrayList and throws the exception NoSuchElementException if there is no next element.
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 The best way is to use a List within a List:
List<List<String>> listOfLists = new ArrayList<List<String>>(); 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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