java - GridBagLayout is not displaying as expected -

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this first foray gridbaglayout, have reviewed java documentation online (as lot of q&as) , i've creating panel i'm expecting display such:

+--------------------------+ |      choose timer      | +--------+--------+--------+ |  5min  |  25min | 30min  | +--------+--------+--------+ |         00:00:00         | +--------+--------+--------+ |  start |  pause |  quit  | +--------+--------+--------+

and here's gridbaglayout i'm using.

public class buttonsel extends jframe implements actionlistener {     jlabel buttonsellabel = new jlabel("choose timer run");     jbutton pomobutton    = new jbutton("00:25:00");     jbutton shrtbutton    = new jbutton("00:05:00");     jbutton longbutton    = new jbutton("00:30:00");     jbutton startbutton   = new jbutton("go");     jbutton pausebutton   = new jbutton("pause");     jbutton quitbutton    = new jbutton("quit");     jlabel textdisplay    = new jlabel("00:00:00");      //     jpanel timerpanel     = new jpanel();      //  public buttonsel() {     super("buttontest");     setdefaultcloseoperation(jframe.exit_on_close);     setlayout(new gridbaglayout());     gridbagconstraints c = new gridbagconstraints();              add(buttonsellabel, c);    // line 1              c.fill = gridbagconstraints.horizontal;              c.gridx = 1;              c.gridy = 1;              c.gridwidth = 3;              add(pomobutton, c);        // line 2              c.gridx = 1;              c.gridy = 2;              c.gridwidth = 1;              add(shrtbutton, c);              c.gridx = 2;              c.gridy = 2;              c.gridwidth = 1;              add(longbutton, c);              c.gridx = 3;              c.gridy = 2;              c.gridwidth = 1;              add(textdisplay, c);       // line 3              c.fill = gridbagconstraints.horizontal;              c.gridx=1;              c.gridy=3;              c.gridwidth=3;              add(startbutton, c);       // line 4              c.gridx = 1;              c.gridy = 4;              c.gridwidth = 1;              add(pausebutton, c);              c.gridx = 2;              c.gridy = 4;              c.gridwidth = 1;              add(quitbutton, c);              c.gridx = 2;              c.gridy = 4;              c.gridwidth = 1;      pomobutton.addactionlistener(this);     shrtbutton.addactionlistener(this);     longbutton.addactionlistener(this);     startbutton.addactionlistener(this);     pausebutton.addactionlistener(this);     quitbutton.addactionlistener(this); } public void actionperformed(actionevent radioselect) {     object source = radioselect.getsource();     if (source == pomobutton)         textdisplay.settext("00:25:00");     else     if (source == shrtbutton)         textdisplay.settext("00:05:00");     else     if (source == longbutton)         textdisplay.settext("00:30:00");     else     if (source == startbutton)         textdisplay.settext("started");     else     if (source == pausebutton)         textdisplay.settext("paused");     else     if (source == quitbutton)         textdisplay.settext("quit");     else         textdisplay.settext("00:00:00"); } }

i getting output,

enter image description here

and taking cue horizontal alignment this question added horizontal constraints the fields. i'm getting:

enter image description here

i've used (0,0) , (1,1) starting (x,y) coordinates, interestingly enough, same results.

can see i'm missing?

i had add few lines make code runnable.

you setting gridbagconstraints after add them component. must set them before add.

the trick set sethorizontalalignment method of jlabels wanted center center alignment.

i formatted code , added insets make gui more visually appealing.

here's picture of gui.

button test gui

and here's code.

import java.awt.gridbagconstraints; import java.awt.gridbaglayout; import java.awt.insets; import java.awt.event.actionevent; import java.awt.event.actionlistener;  import javax.swing.jbutton; import javax.swing.jframe; import javax.swing.jlabel; import javax.swing.jpanel; import javax.swing.swingconstants; import javax.swing.swingutilities;  public class buttonsel extends jframe implements actionlistener {     jlabel  buttonsellabel  = new jlabel("choose timer run");     jbutton pomobutton      = new jbutton("00:25:00");     jbutton shrtbutton      = new jbutton("00:05:00");     jbutton longbutton      = new jbutton("00:30:00");     jbutton startbutton     = new jbutton("go");     jbutton pausebutton     = new jbutton("pause");     jbutton quitbutton      = new jbutton("quit");     jlabel  textdisplay     = new jlabel("00:00:00");     jpanel  timerpanel      = new jpanel();       public buttonsel() {         super("buttontest");         setdefaultcloseoperation(jframe.exit_on_close);          timerpanel = new jpanel();         timerpanel.setlayout(new gridbaglayout());         gridbagconstraints c = new gridbagconstraints();          c.fill = gridbagconstraints.horizontal;         c.anchor = gridbagconstraints.center;         c.weightx = 1.0d;         c.weighty = 1.0d;         c.gridx = 1;         c.gridy = 1;         c.gridwidth = 3;         c.gridheight = 1;         c.insets = new insets(10, 10, 0, 0);         c.ipadx = 0;         c.ipady = 0;         buttonsellabel.sethorizontalalignment(swingconstants.center);         timerpanel.add(buttonsellabel, c); // line 1          c.gridx = 1;         c.gridy = 2;         c.gridwidth = 1;         timerpanel.add(pomobutton, c); // line 2          c.gridx = 2;         c.gridy = 2;         c.gridwidth = 1;         timerpanel.add(shrtbutton, c);          c.gridx = 3;         c.gridy = 2;         c.gridwidth = 1;         c.insets = new insets(10, 10, 0, 10);         timerpanel.add(longbutton, c);          c.fill = gridbagconstraints.horizontal;         c.gridx = 1;         c.gridy = 3;         c.gridwidth = 3;         c.insets = new insets(10, 10, 0, 0);         textdisplay.sethorizontalalignment(swingconstants.center);         timerpanel.add(textdisplay, c); // line 3          c.gridx = 1;         c.gridy = 4;         c.gridwidth = 1;         c.insets = new insets(10, 10, 10, 0);         timerpanel.add(startbutton, c); // line 4          c.gridx = 2;         c.gridy = 4;         c.gridwidth = 1;         timerpanel.add(pausebutton, c);          c.gridx = 3;         c.gridy = 4;         c.gridwidth = 1;         c.insets = new insets(10, 10, 10, 10);         timerpanel.add(quitbutton, c);          pomobutton.addactionlistener(this);         shrtbutton.addactionlistener(this);         longbutton.addactionlistener(this);         startbutton.addactionlistener(this);         pausebutton.addactionlistener(this);         quitbutton.addactionlistener(this);          this.add(timerpanel);         this.pack();         this.setvisible(true);     }      public void actionperformed(actionevent radioselect) {         object source = radioselect.getsource();         if (source == pomobutton)             textdisplay.settext("00:25:00");         else if (source == shrtbutton)             textdisplay.settext("00:05:00");         else if (source == longbutton)             textdisplay.settext("00:30:00");         else if (source == startbutton)             textdisplay.settext("started");         else if (source == pausebutton)             textdisplay.settext("paused");         else if (source == quitbutton)             textdisplay.settext("quit");         else             textdisplay.settext("00:00:00");     }      public static void main(string[] args) {         swingutilities.invokelater(new runnable() {             @override             public void run() {                 new buttonsel();                         }         });     }  }

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