How to Append Elements to the End of an ArrayList in Java?

How do you add elements to the end of an ArrayList in Java?

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

// Adding an element at end
list.add("Element 1");

Appending elements to the end of an ArrayList in Java is a straightforward process using the `add()` method. This method allows you to dynamically manage the contents of the ArrayList as it automatically resizes itself to accommodate new items.

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

// Adding multiple elements
list.add("Element 1");
list.add("Element 2");
list.add("Element 3");

System.out.println(list); // Output: [Element 1, Element 2, Element 3]

Causes

• Using the wrong method to add elements.
• Forgetting to import the correct package for ArrayList.
• Incorrect data type for elements being added.

Solutions

• Use `list.add(element)` to append the element to the end of the list.
• Ensure that your data type matches that of the ArrayList.
• Import `java.util.ArrayList` at the beginning of your Java file.

Mistake: Not initializing the ArrayList before using it.

Solution: Make sure to declare and instantiate the ArrayList using `new ArrayList<>()`.

Mistake: Using `add()` method incorrectly, such as mixing up parameters or types.

Solution: Check that you are using the `add()` method correctly as it requires one argument, the element to be added.