java - How do you access/modify a JFrame object from a different class? -

i trying create code create text box inside of jframe object , after button clicked, text inside box change. still confused on how create text box , how edit inside other class. have tried far won't work due lack of ability access jframe separate class. have far.

import javax.swing.jbutton; import javax.swing.jpanel; import javax.swing.jframe; import javax.swing.jlabel; import javax.swing.jtextarea; import java.awt.*; import java.awt.event.*;  public class blackjackgui{ public static void main(string[] args){  jframe frame= new jframe("blackjack"); frame.setvisible(true); frame.setdefaultcloseoperation(jframe.exit_on_close); frame.setsize(400, 500); jpanel panel=new jpanel(); frame.add(panel); jbutton hit=new jbutton("hit"); panel.add(hit); hit.addactionlistener(new action()); //make text box }  static class action extends blackjackgui implements actionlistener{  public void actionperformed (actionevent e){      //code edit text in text box         }  } }   

• first , foremost: most of code out of static main method. jframe buried in main method making , child components inaccessible. goal have 2 objects interact, , require create well-behaved oop-compliant classes. -- create classes fields, such jtextarea field if need be, public accessor , mutator methods, constructors.
• yes need main method, purpose should create main actors, allow them connect somehow (say passing 1 parameter other), , setting program in motion. should little else.
• next , important: don't use inheritance purpose since inheritance not used allow 1 class communicate (at least not you're using it). example, having 2nd class inherit blackjackgui serve no useful purpose.
• instead composition key. have 1 class hold field of other type , assign correct viable reference, , voilà, you're set.