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Thank you very much for your advice. Im new to Programming. So struggling even with small programs. I ll try according to your gudence and see.

When you click on the item on the Combo box, those items should add to JList. (If the item is already in JList, Message will pop up to to avoid Duplicate adding)
Problem is Items on combobox not...

Code Excutes. But when i select items on combo box, it addes all items to Jlist without giving error message to avoid Duplicates.
Sorry about confusion.

Hi
in the following program, Im trying to add some items to Jlist using JComboBox without any duplicates.
I managed to add items with Duplicates, As well as I managed to find duplicates using this...