Java 1D ArrayLists Quiz

How do you declare an ArrayList in Java?

• `ArrayList al = new ArrayList();`

• `ArrayList[] al = new ArrayList();`

• `ArrayList<> al = new ArrayList<>();`

• `List al = new ArrayList();`

Which of the following is the correct way to initialize an ArrayList of Strings?

• `ArrayList list = new ArrayList();`

• `ArrayList list = new ArrayList();`

• `List list = new ArrayList<>();`

• All of the above

How do you add an element to an ArrayList?

• `list.addElement("Hello");`

• `list.add("Hello");`

• `list.insert("Hello");`

• `list.put("Hello");`

How do you access the element at index 2 in an ArrayList `list`?

• `list[2];`

• `list.get(2);`

• `list.elementAt(2);`

• `list.indexOf(2);`

Which method is used to modify the element at index 3 in an ArrayList `list`?

• `list.set(3, "New Element");`

• `list.add(3, "New Element");`

• `list.replace(3, "New Element");`

• `list.update(3, "New Element");`

How do you remove the element at index 4 in an ArrayList `list`?

• `list.remove(4);`

• `list.delete(4);`

• `list.erase(4);`

• `list.cut(4);`

Which of the following is NOT a built-in method of ArrayList?

• `clear()`

• `length()`

• `size()`

• `isEmpty()`

How do you find the number of elements in an ArrayList `list`?

• `list.length();`

• `list.size();`

• `list.capacity();`

• `list.count();`

Which method is used to sort an ArrayList `list` in ascending order?

• `Arrays.sort(list);`

• `Collections.sort(list);`

• `list.sort();`

• `list.order();`

How do you check if an ArrayList `list` contains a specific element "Element"?

• `list.contains("Element");`

• `list.has("Element");`

• `list.includes("Element");`

• `list.find("Element");`