java - Adding JScrollPane in JTextArea using GridBagLayout -

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i'm having issue adding jscrollpane in jtextarea using gridbaglayout. program runs fine when scrollbar isn't needed layout gets messed , content gets cut off when is. relevent code follows

import java.io.*; import java.awt.*; import javax.swing.*; import java.awt.event.*; import java.util.*;  public class testgui extends jframe {     public static string name;     static jtextfield textfield = new jtextfield(30);     static jtextarea  textarea = new jtextarea(30,30);      public static void main( string[] args)     {          jframe frame = new jframe();         frame.setdefaultcloseoperation(jframe.exit_on_close);         frame.settitle("checkem");         frame.setlocation(500,400);         frame.setsize(800,800);          jpanel panel = new jpanel(new gridbaglayout());         gridbagconstraints c = new gridbagconstraints();         jscrollpane scrolltxt = new jscrollpane(textarea,jscrollpane.vertical_scrollbar_as_needed,jscrollpane.horizontal_scrollbar_never);         scrolltxt.setwheelscrollingenabled(true);          scrolltxt.getverticalscrollbar().isvisible();         panel.add(scrolltxt, c);           jlabel label = new jlabel("enter name of file:");         c.gridx = 0;         c.gridy = 0;         c.insets = new insets(2,2,2,2);          panel.add(label,c);          c.gridx = 0;         c.gridy = 1;         panel.add(textarea,c);                jbutton button = new jbutton("search");         c.gridx = 1;         c.gridy = 1;         panel.add(button,c);          c.gridx = 1;         c.gridy = 0;         panel.add(textfield,c);           frame.getcontentpane().add(panel, borderlayout.north);         frame.pack();         frame.setvisible(true);          button.addactionlistener(new actionlistener()         {             public void actionperformed(actionevent ae)             {                 checkem record = new checkem();                 name = textfield.gettext();                          string [] print = record.run(name);                  (int i=0;i<print.length;i++)                 {                     if(print[i] == null || print[i].isempty())                     {                         continue;                     }                     else                     {                         textarea.append(print[i] + "\n");                     }                 }             }         });      } }

i'm new swing , i'm @ loss go here. help.

now actual thingy :-)

  • why not use jtextarea.setlinewrap(true) , jtextarea.setwrapstyleword(true) instead of defining jscrollbar policy, nice on view :-)
  • moreover, instead of specifying setsize()/setlocation() methods, use framereference.pack() , frame.setlocationbyplatform(true), wonderful answer regarding benefit of latter mentioned in answer, how best position swing guis
  • do not make many static fields in class, smells bad programming design, , makes class less extensible.
  • you extending jframe testgui class , inside it's main() method creating instance of same. again, try give more weightage composition on inheritance, since on here, not trying modify defined features of jframe, instead using them is, there no need extend jframe in case atleast :-)
  • read concurrency in swing

here modified code : 

import java.io.*; import java.awt.*; import javax.swing.*; import java.awt.event.*; import java.util.*;  public class testgui {      private string name;     private jtextfield textfield = new jtextfield(30);     private jtextarea  textarea = new jtextarea(30,30);      private void displaygui() {         jframe frame = new jframe();         frame.setdefaultcloseoperation(jframe.exit_on_close);         frame.settitle("checkem");                  jpanel panel = new jpanel(new gridbaglayout());         gridbagconstraints c = new gridbagconstraints();         textarea.setlinewrap(true);         textarea.setwrapstyleword(true);         jscrollpane scrolltxt = new jscrollpane();         scrolltxt.setviewportview(textarea);         scrolltxt.setwheelscrollingenabled(true);          jlabel label = new jlabel("enter name of file:");         c.gridx = 0;         c.gridy = 0;         c.insets = new insets(2,2,2,2);          panel.add(label,c);          c.gridx = 0;         c.gridy = 1;         panel.add(scrolltxt,c);                jbutton button = new jbutton("search");         c.gridx = 1;         c.gridy = 1;         panel.add(button,c);          c.gridx = 1;         c.gridy = 0;         panel.add(textfield,c);           frame.getcontentpane().add(panel, borderlayout.north);               //frame.setsize(800,800);         frame.pack();         frame.setlocationbyplatform(true);         frame.setvisible(true);          button.addactionlistener(new actionlistener()         {             public void actionperformed(actionevent ae)             {                 /*checkem record = new checkem();                 name = textfield.gettext();                          string [] print = record.run(name);                  (int i=0;i<print.length;i++)                 {                     if(print[i] == null || print[i].isempty())                     {                         continue;                     }                     else                     {                         textarea.append(print[i] + "\n");                     }                 }*/             }         });     }      public static void main( string[] args) {         runnable r = new runnable() {             @override             public void run() {                 new testgui().displaygui();             }         };         eventqueue.invokelater(r);     } }

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