how to create a arraylist of arrray list in java code example

Example 1: how to make an array of arraylists in java

ArrayList<Integer> [] myList = (ArrayList<Integer>[]) new ArrayList[4];

Example 2: how to make an arraylist java

ArrayList<Integer> integerArray = new ArrayList<Integer>();
ArrayList<String> stringArray = new ArrayList<String>();
ArrayList<Double> doubleArray = new ArrayList<Double>();
//... keep replacing what is inside the <> with the appropriate
//data type

Example 3: how to create an array list in java

List<Integer> list = new ArrayList<>();