how to convert matrix to arraylist arraylist in java code example

Example 1: java array to arraylist

List<Element> list = Arrays.asList(array);

Example 2: convert arraylist to array in java

Integer[] arr = new Integer[al.size()]; 
  
        // ArrayList to Array Conversion 
        for (int i = 0; i < al.size(); i++) 
            arr[i] = al.get(i);