Java Tutorial : Auto Completing JTextField | Auto Suggesting Textbox | Java Swing

Java Tutorial : Auto Completing JTextField | Auto Suggesting Textbox | Java Swing

Code :-
Watch the video above to understand how to autocomplete jtextfield
Code of set 
Set<String> s=new TreeSet<String>();
        s.add("unpossible");
        s.add("pog");
         s.add("steve rogers");

Copy below code in key_released event of jtextfield.

if(evt.getKeyCode()==KeyEvent.VK_BACK_SPACE||evt.getKeyCode()==KeyEvent.VK_DELETE)
        {
           
        }
        else
        {   
            String to_check=jTextField1.getText();
            int to_check_len=to_check.length();
            for(String data:s)
            {
                String check_from_data="";
                for(int i=0;i<to_check_len;i++)
                {
                    if(to_check_len<=data.length())
                    {
                        check_from_data = check_from_data+data.charAt(i);
                    }
                }
                //System.out.print(check_from_data);
                if(check_from_data.equals(to_check))
                {
                    //System.out.print("Found");
                    jTextField1.setText(data);
                    jTextField1.setSelectionStart(to_check_len);
                    jTextField1.setSelectionEnd(data.length());
                    break;
                }
            }
        }