The following method(s) can be used to replace an item in an ArrayList in the same position in the lista.add(E) methodb.set(int, E) methodc.remove(int) method and then add(E) methodd.remove(int) method and then set(E) methode.none of the above
Question
The following method(s) can be used to replace an item in an ArrayList in the same position in the lista.add(E) methodb.set(int, E) methodc.remove(int) method and then add(E) methodd.remove(int) method and then set(E) methode.none of the above
Solution
The correct method to replace an item in an ArrayList in the same position is:
b. set(int, E) method
Here's why:
a. add(E) method: This method is used to append an element to the end of the ArrayList. It does not replace an existing element.
b. set(int, E) method: This method is used to replace the element at the specified position in this list with the specified element. This is the correct method to replace an item in the same position.
c. remove(int) method and then add(E) method: This would first remove the element at the specified position, then add the new element to the end of the list, not in the same position.
d. remove(int) method and then set(E) method: This would first remove the element at the specified position, but then you would not be able to set a new element in that position because the size of the ArrayList has decreased by one.
e. none of the above: This is incorrect because option b is the correct method.
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