java - Why JTextArea doesn't work with JPanel? -

why when add jtextarea jpanel doesn't work? when use jbutton instead of jtextarea works corectly. why doesn't jtextarea work jpanel jframe does?

public class searching extends jpanel {      private jpanel searchpanel;     private jtextarea addmedicament;      public searching(){         searchpanel = new jpanel();         searchpanel.setlayout(new gridlayout(1,1));         setbackground(color.blue);          addmedicament = new  jtextarea();         searchpanel.add(addmedicament);          this.add(searchpanel);     }  } 

a text area work fine panel.

try creating text area follows:

jtextarea textarea = new jtextarea(5, 20); jscrollpane = new jscrollpane( textarea ); panel.add( scrollpane ); 

now text area created preferred size. data changed scrollbars appear/disappear required because problem code , context of how use code, not panel or text area.

if doesn't post proper sscce demonstrates problem.