This Tutorial will teach you how to make a Autocomplete ComboBox using Java.
In order to do the AutoComplete ComboBox First you must download the jar file swingx-all-1.6.4.jar. just go to the google and type swingx-all-1.6.4.jar.
after that when the JFrame is Loaded Combobox loaded with AutoComplete. paste the code inside the Constructor.
public Autocom() { initComponents(); AutoCompleteDecorator.decorate(Items); }
i have attached the video link below. which will do this tutorials step by step.