How can I delete batch file text in java

Hi,

I am using GUI as Swings. When I select items from the dropdown(Combobox) that should be added to the batch file dynamically( I need to add dynamically for 4 drop downs) …

After that once again user want to select other items from the drop down , first selected items should be removed and recent items needs to added to batch file…( I am hitting batch file through java code)

please help me out if someone knows …