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30 November, 04:03

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);

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Answers (1)
  1. 30 November, 04:44
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    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.
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