Updating names in a contact list
A contact management system stores names in a list. When a name needs to be updated (e.g., correcting typos), you can use ListIterator to modify entries while iterating.
All the necessary classes from java.util have been imported for you.
この演習はコースの一部です
Input/Output and Streams in Java
演習の手順
- Create a
ListIteratorobject for thecontactslist. - In the condition of the while loop, check if more elements are available in the
contactslist. - Retrieve next element.
- If a name is
Jon, set it toJohninstead.
実践的なインタラクティブ演習
このサンプルコードを完成させて、この演習に挑戦してみましょう。
public class ContactUpdater {
public static void main(String[] args) {
ArrayList contacts = new ArrayList<>();
contacts.add("Alice");
contacts.add("Jon");
contacts.add("Charlie");
// Create ListIterator for the contacts list
ListIterator it = contacts.____();
// Check if more elements are available
while (____.____()) {
// Retrieve next element
String name = ____.____();
if (name.equals("Jon")) {
// Update element to "John"
____.____("John");
}
}
System.out.println(contacts);
}
}