Thread: Hello experts, i here gave a program which i likes to print the duplicates in an arraylist, but getting ConcurrentModificationException.. help me get solved

package silverbullet;
 
import java.util.ArrayList;
 
public class StringProcessing {
 
	public static ArrayList<String> list=new ArrayList<String>(10);
	public static ArrayList<String> deleted=new ArrayList<String>(10);
	public void set()
	{
	list.add("hello");
	list.add("hi");
	list.add("hello");
	list.add("bye");
	}
	public void print()
	{
		for(int i=0;i<deleted.size();i++)
		{
			System.out.println(deleted.get(i));
		}
	}
	public static void main(String[] args) {
		StringProcessing sp=new StringProcessing();
		sp.set();
 
		for(Object l:list)
		{
			int c=0;
			String s=l.toString();
			for(int i=0;i<(list.size()-c);i++)
			{
 
				if(s==list.get(i+1))
				{
					list.remove(i+1);
					deleted.add(s);
					c=c+1;
				}
			}
		}
                      sp.print();
	}
 
}

i tried lot, changed code. but getting the exception of "ConcurrentModificationException"
my concept of this program is to print the items which are duplicated in the ArrayList named list, and storing the duplicates in the new ArrayList named deleted.

Help me fix this problem

Please find below the answer to ur question:

1. firstArray is used to store the list of array elements which contains the duplicate entries
2. filterList is used to store the elements which has no duplicate entries ....
HAPPY && ENJOY coding ...........

...code removed

yes . I will be careful on that Thanks !!