the question is how can I make it come to the default value automatically ( example: 0; ) when i select second item in the combobox.
You need to invoke the code that is executed when you click on the radio button. That is every time you select an item from the combo box you need to do two things:
1) update the image
2) query the radio button to determine which one is selected and then display the data related to that radio button.
Also, quit cross posting questions:
http://stackoverflow.com/questions/29677098/about-jcombobox-and-jradiobutton. Its annoying when you spend time answering a question only to find out it was answered somewhere else.