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)
d. namelistj == name

Explanation:

To compare the content of two String objects in Java, the equals() method must be used, as it checks for value equality. The == operator checks for reference equality (if the two objects point to the same memory location), which is not reliable for comparing String content. Option C is a method call that removes an element, not a comparison. Option D uses invalid syntax for accessing ArrayList elements (ArrayLists use get(), not bracket notation like arrays).

Answer:

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