Java, how to delete integer items in ArrayList

Suppose I have such an ArrayList:

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

After adding operations:

list.add(2);
list.add(3);
list.add(5);
list.add(7);

I want to delete No. 2 if I do

list.remove(2);

Then No. 5 will be deleted. How can I delete No. 2? Suppose I don't know the index of No. 2

Solution

Try this

list.removeAll(Arrays.asList(2));

It will delete all elements with value = 2

You can also use this

list.remove(Integer.valueOf(2));

But it will only delete the first occurrence 2

list. Remove (2) does not work because it matches list Remove (int i), which deletes the element of the specified index