how to check if an element is in arraylist java

// creating an Empty Integer ArrayList
        ArrayList<Integer> arr = new ArrayList<Integer>(4);
// using add() to initialize values
// [1, 2, 3, 4]
        arr.add(1);
        arr.add(2);
        arr.add(3);
        arr.add(4); 
// use contains() to check if the element
// 2 exits or not
        boolean ans = arr.contains(2);

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