Exception Inwards Thread Primary Java.Lang.Illegalstateexception During Iterator.Remove()

I was writing a sample programme to demonstate how to withdraw elments from list spell iterating over it past times using Iterator.remove() mehtod. Unfortunately I was getting next error, correct at the house where I was calling the Iterator.remove() method :

Exception inwards thread "main" java.lang.IllegalStateException
at java.util.ArrayList$Itr.remove(Unknown Source)
at dto.IteratorRemoveTest.main(IteratorRemoveTest.java:25)

I was puzzled, why I am getting this error because I was using Iterator's remove() method as well as non the ArrayList's remove() method, which causes ConcurrentModificationException inwards Java.

java.lang.IllegalStateException during Iterator.remove()

Here is my code, Can you lot topographic point what is wrong, without looking at the solution

import java.util.ArrayList; import java.util.Arrays; import java.util.Iterator; import java.util.List;  /**  * Java Program to demonstrate how to withdraw elements from List spell  * traversing over it using Iterator.  *   * @author WINDOWS 8  */ public class IteratorRemoveTest {      public static void main(String args[]) {          List<String> brands = new ArrayList(                                 Arrays.asList("Apple", "Microsoft, Google"));                       System.out.println("Java Program to withdraw elements from listing via Iteator");         System.out.println("List earlier removing elements: " + brands);                  for (final Iterator<String> itr = brands.iterator(); itr.hasNext();) {             itr.remove();         }                  System.out.println("List after removing elements: " + brands);     }  }  Output: Java Program to withdraw elements from listing using Iteator List earlier removing elements: [Apple, Microsoft, Google] Exception inwards thread "main" java.lang.IllegalStateException     at java.util.ArrayList$Itr.remove(ArrayList.java:849)     at IteratorRemoveTest.main(IteratorRemoveTest.java:25) Java Result: 1

By carefully looking at code as well as error message I afterwards figure out that I was calling Iterator.remove() method without calling the Iterator.next(), which was causing this probelm.

To ready this merely telephone band the Iterator.next() earlier calling Iterator.remove() method, every bit shown below:

for (final Iterator<String> itr = brands.iterator(); itr.hasNext();) {      itr.next();      itr.remove(); 

}

Now, if you lot run the Java program, you lot volition larn next output

Java Program to remove elements from list using Iteator List before removing elements: [Apple, Microsoft, Google] List after removing elements: []

Our code ran successfully.  Here is the prissy summary of things you lot should know spell trying to delete elments from Java collection or listing using Iteartor's remove() method:

That's all virtually how to solve Exception inwards thread "main" java.lang.IllegalStateException during Iterator.remove() inwards Java program. Sometime, you lot build lightheaded mistakes which causes error looking similar a big monster. So, if you lot can't run across the error, receive got a interruption as well as they hold off it again, you lot volition honor it. 

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