java - How to pass values from one JFrame to another JFrame? -

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i've created 2 jframes. main jframe contains text area. sub jframe contains drop down list. task pass value i've selected in drop down list , display in text area in main jframe.

code in sub jframe:

private void btnokactionperformed(java.awt.event.actionevent evt) {     close();           room=cmbroom.getselecteditem().tostring(); }

code in main jframe:

private void btndisplayactionperformed(java.awt.event.actionevent evt) {     roomno r=new roomno();     txtarea2.append("\nroom number: " + r.getroom()); }                                            

import java.awt.*; import javax.swing.*; import java.awt.event.*;  class passdata extends jframe {     jtextfield text;     passdata(){     jlabel l=new jlabel("name: ");     text=new jtextfield(20);     jbutton b=new jbutton("send");     setlayout(null);     l.setbounds(10,10,100,20);     text.setbounds(120,10,150,20);     b.setbounds(120,40,80,20);     add(l);     add(text);     add(b);     setvisible(true);     setsize(300,100);       b.addactionlistener(new actionlistener(){         public void actionperformed(actionevent e){         string value=text.gettext();         nextpage page=new nextpage(value);         page.setvisible(true);         }     });    }     public static void main(string[] args)    {     new passdata();   } }

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