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immutable object

concurrentmodificationexception in java


ConcurrentModificationException in java

At the time of iterating collection values we want to modify collection data then we will get java.util.ConcurrentModificationException.

java.util.ConcurrentModificationException exception we will get for existing non thread-safe classes like ArrayList, HashSet etc only.But in case of Concurrent classes we will not get this exception.

Example

package javagf;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class GetConcurrentModificationException {

 public static void main(String[] args) {
    List list = new ArrayList();
    list.add("Vikash");
    list.add("Vicky");
    list.add("Rahul");
    Iterator iterator = list.iterator();
     while (iterator.hasNext()) {
     System.out.println(iterator.next());
     list.add("Alex");// ConcurrentModificationException
    }
  }
}

Output

Vikash
Exception in thread "main" java.util.ConcurrentModificationException






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