how to make an arraylist java

1ArrayList<Integer> integerArray = new ArrayList<Integer>();
2ArrayList<String> integerArray = new ArrayList<String>();
3ArrayList<Double> integerArray = new ArrayList<Double>();
4//... keep replacing what is inside the <> with the appropriate
5//data type
6

1ArrayList<Integer> integerArray = new ArrayList<Integer>();
2ArrayList<String> stringArray = new ArrayList<String>();
3ArrayList<Double> doubleArray = new ArrayList<Double>();
4//... keep replacing what is inside the <> with the appropriate
5//data type

1ArrayList<Type> name = new ArrayList<Type>();

1List<Integer> list = new ArrayList<>();

1//Create the Arraylist variable: . Replace the T with the type of 
2//data to be stored in the list.
3ArrayList<T> exampleList = new ArrayList<>();
4//You can now perform operations on this ArrayList