Authors:
Stuart Reges, Marty Stepp
Chapter:
Arraylists
Exercise:
Exercises
Question:4 | ISBN:9780136091813 | Edition: 2
Question
Write a method called doubleList that takes an ArrayList of String s as a parameter and replaces every String with two of that same String . For example, if the list stores the values (“how”, “are”, “you?”) before the method is called, it should store the values (“how”, “how”, “are”, “are”, “you?”, “you?”) after the method finishes executing.
Answer
Implementation of doubleList method:
public static void doubleList(ArrayList strList)
{
for(int i = 0; i < strList.size(); i += 2)
{
String str = strList.get(i);
strList.add(i + 1, str);
}
}