import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
public class ArrayListExample {
public static void main(String[] args) {
List li = new ArrayList<>();
/*
Here <> this is call generic notation or diamond operator
while using list we must specify the type of the variable
that we are going to store in the list
Arraylist is like a growing array
*/
li.add("Patna");
li.add("Ranchi");
li.add("Bengaluru");
li.add("Lucknow");
System.out.println(li);
// Output = [Patna, Ranchi, Bengaluru, Lucknow]
li.remove(0);
System.out.println(li);
/*
Output = [Ranchi, Bengaluru, Lucknow]
When we are printing li we are actually calling the toString method on li
*/
// getting an element from the arraylist
String state = li.get(1);
System.out.println("The second state is "+state);
// Finding an item in the list
int pos = li.indexOf("Lucknow");
System.out.println("Lucknow is at position "+pos);
// Iterating the list with an iterator
Iterator iterator = li.iterator();
while (iterator.hasNext()){
System.out.println(iterator.next());
}
System.out.println(); // Added an extra line
// Iterating the same list with a forEach loop
for (String data : li){
System.out.println(data);
}
System.out.println(); // Added an extra line
// Iterating using forEach ( Available after java 8 and latter and not in android
li.forEach(System.out::println);
}
}