Assume that you have an ArrayList variable named a containing 4 elements, and an object named element that is the correct type to be stored in the ArrayList.

Which of these statements adds the object to the end of the collection?1. a[3] = element;

2. a. add (element;

3. a[4] = element;

4. a. add (element);

Question

Computers & Technology

Moran

7 November, 10:39

Assume that you have an ArrayList variable named a containing 4 elements, and an object named element that is the correct type to be stored in the ArrayList.

Which of these statements adds the object to the end of the collection?1. a[3] = element;

2. a. add (element;

3. a[4] = element;

4. a. add (element);

+4

Answers (1)

Know the Answer?

Christopher Reid · Answer 1

Option (4) is the correct answer.

Explanation:

In Java programming language, array collection starts from 0 index location and ends in a size-1 index location. So to access the last elements the user needs to use a[Size-1] statement. so to modify the value of the last location of the array the user needs to use "a[size-1] = element; ".

But when the user wants to add some new value to the end of the array list collection then he needs to use the statement--

a. add (element); / /where add is a function, element is a value and a is a array list object.

Another option is invalid because--

Option 1 is not the correct because "a[3]=element; " modify the value of the 3rd element of the array. Option 2 gives a compile-time error because add functions bracts are not closed. Option 3 gives the error because a[4] gives the location of the 5th element of the array but the above question says that a is defined with 4 elements.