How to Properly Remove Integers from a List in Java?

Removing Integers from List

When working with List, proper removal of integers requires discerning between the two remove methods: remove(int index) and remove(Object o).

The first method, remove(index), removes the element at the specified index. However, the second method, remove(o), removes the first occurrence of the specified element.

Pitfalls

Consider a list of integers:

List<Integer> list = new ArrayList<>();
list.add(5);
list.add(6);
list.add(7);
list.add(1);

Executing list.remove(1) removes the element at index 1, which is the integer 6. On the other hand, list.remove(new Integer(1)) removes the first occurrence of the integer 1 from the list.

Proper Removal

To differentiate between remove(int index) and remove(Object o), consider the following principles:

• Java prioritizes exact parameter matching over auto-boxing.
• The List interface specifies two remove methods with distinct argument types.

Conclusion

To remove an element from a specific index, use list.remove(index). To remove the first occurrence of an integer, use list.remove(new Integer(integer)). Understanding these principles ensures proper handling of integer removal in List.

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