Add ArrayList to another ArrayList in java

Question

I am having the following java code, in which I am trying to copy the ArrayList to another ArrayList.

 ArrayList nodes = new ArrayList

        

Answer 1

Then you need a ArrayList of ArrayLists:

ArrayList> nodes = new ArrayList>();
ArrayList nodeList = new ArrayList();
nodes.add(nodeList);

Note that NodeList has been changed to nodeList. In Java Naming Conventions variables start with a lower case. Classes start with an upper case.