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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

  1. #1
    Member vigneshwaran's Avatar
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    Angry 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


  2. #2
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    Default Re: Hello experts, i here gave a program which i likes to print the duplicates in an arraylist, but getting ConcurrentModificationException.. help me get solved

    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

  3. The Following User Says Thank You to mikeclark For This Useful Post:

    vigneshwaran (October 24th, 2013)

  4. #3
    Super Moderator Norm's Avatar
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    Default Re: Hello experts, i here gave a program which i likes to print the duplicates in an arraylist, but getting ConcurrentModificationException.. help me get solved

    "ConcurrentModificationException"
    Use the old style for loop that uses an index, not the new for each style.
    If you don't understand my answer, don't ignore it, ask a question.

  5. The Following User Says Thank You to Norm For This Useful Post:

    vigneshwaran (October 24th, 2013)

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    Super Moderator copeg's Avatar
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    Default Re: Hello experts, i here gave a program which i likes to print the duplicates in an arraylist, but getting ConcurrentModificationException.. help me get solved

    @mikeclark, please read the forum rules and the following:
    http://www.javaprogrammingforums.com...n-feeding.html

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

    yes . I will be careful on that Thanks !!

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