It is tricky to remove items from a list while within a loop, this is due to the fact that the index and length of the list get changed.
It is a good idea to delete an item from List using Iterator interface remove() method. The same goal can be achieved using removeIf() option
package com.pwn.collection;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
public class RmvItemFrmCollectoin {
public static void main(String[] args) {
List<String> cities = new ArrayList<String>();
cities.add("San Francisco");
cities.add("New York");
cities.add("San Diego");
System.out.println("Before deleting List " + cities);
Iterator<String> citiesIterator = cities.iterator();
while (citiesIterator.hasNext()) {
String city = citiesIterator.next();
if ("San Diego".equals(city)) {
citiesIterator.remove();
}
}
System.out.println("After deleting List " + cities);
cities = new ArrayList<String>();
cities.add("San Francisco");
cities.add("New York");
cities.add("San Diego");
cities.removeIf(p -> "San Diego".equals(p));
System.out.println("After deleting List " + cities);
}
}
Before deleting List [San Francisco, New York, San Diego]
After deleting List [San Francisco, New York]
After deleting List [San Francisco, New York]
