Question

consider the following method that is intended to modify its parameter namelist by replacing all occurrences of name with newvalue.
public void replace(arraylist<string> namelist, string name, string newvalue)
{
for (int j = 0; j < namelist.size(); j++)
{
if ( / expression / )
{
namelist.set(j, newvalue);
}
}
}
which of the following can be used to replace / expression / so that replace will work as intended?
a
namelist.get(j).equals(name)
b.
namelist.get(j) == name
c.
namelist.remove(j)

Explanation:

To determine the correct expression for the if condition, we analyze each option:

• Option A: In Java, to compare the contents of two strings (since nameList contains strings), we use the equals() method. nameList.get(j).equals(name) checks if the string at index j in the list is equal to the name string, which is the correct way to check for a match for replacement.
• Option B: Using == to compare strings in Java checks for reference equality (whether they refer to the same object in memory), not content equality. So this is incorrect for checking if the string contents match.
• Option C: nameList.remove(j) is a method to remove an element from the list, not to check for a match. So this is irrelevant for the if condition's purpose of checking if a replacement is needed.

Answer:

A. nameList.get(j).equals(name)