Which method is used to replace the element at a specific index in an ArrayList in Java?Question 3Answera.set()b.replace()c.modify()d.assign()

Breakdown of the Problem

1. Identify the methods used to manipulate elements in an ArrayList in Java.
2. Determine which method specifically replaces an element at a specific index.

Relevant Concepts

The Java ArrayList class provides several methods to manipulate the elements. Among these, the primary method for replacing an element at a specific index is set(int index, E element).

Analysis and Detail

1. The set() method allows you to replace the element at the specified index with a new value.
2. The parameters required for this method are:
   • index: the position of the element to replace.
   • element: the new value to assign to that position.

Verify and Summarize

Of the options given:

• a. set() is the correct answer, as it corresponds to the method that directly alters an existing element in the ArrayList.
• Other options (b, c, d) are not valid methods used for this purpose in Java.

Final Answer

The method used to replace the element at a specific index in an ArrayList in Java is a. set().