i need to find a integer data in arraylist?

Question

I have an Arraylist. If user enter the same number secondly I want to show to user. For this I need to find Arraylist have it or not.

I hop

Answer 1

If you are checking to see if some value is stored in an ArrayList you can use the contains() method, this will return true if the object is in the list, false otherwise.

ArrayList intList = new ArrayList<>();

intList.add(5);
intList.add(7);
intList.add(3);
intList.add(-2);

intList.contains(-1); //returns false
intList.contains(3); //returns true