This Java code defines a class named ArrayListAndIterator
that contains a main
method.
The main
method creates an ArrayList
of type String
named customerList
. It then declares two strings k1
and k2
and adds them to the customerList
using the add
method.
Next, the code creates an Iterator
named iter
that is obtained from the iterator
method of the customerList
object. The Iterator
is an interface that is used to traverse elements in a collection and is commonly used to traverse ArrayList
s.
Finally, the code uses a while
loop to iterate through the customerList
using the Iterator
. The while
loop continues as long as the iter.hasNext()
method returns true
, indicating that there are more elements in the customerList
to be processed. Inside the while
loop, the code calls the iter.next()
method to retrieve the next element in the customerList
and prints it to the console using System.out.println
. The loop continues until all elements have been processed and iter.hasNext()
returns false
.
import java.util.ArrayList;
import java.util.Iterator;
class ArrayListAndIterator {
public static void main(String[] args) {
ArrayList<String> customerList = new ArrayList<String>();
String k1 = "Smith";
String k2 = "Johnson";
customerList.add(k1);
customerList.add(k2);
Iterator<String> iter = customerList.iterator();
while (iter.hasNext()) {
System.out.println(iter.next());
}
}
}
Smith
Johnson