java - Why is the middle column not showing up? -


i making simple calculator gui in java start learn how use java. following code not working. first column appearing. second , third column going?

    package start;       import java.awt.*;     import javax.swing.*;             public class calculatorgui {  public static void addcomponentstopane(container pane) {      pane.setlayout(new gridbaglayout());     gridbagconstraints c = new gridbagconstraints();     c.fill = gridbagconstraints.horizontal;      jlabel label;     jbutton button;      label = new jlabel("i'm calculator");     c.gridwidth = gridbagconstraints.remainder;     c.weightx = 0.0;     c.gridx = 0;     c.gridy = 0;     pane.add(label, c);      button = new jbutton("1");     c.gridx = 0;     c.gridy = 1;     pane.add(button, c);      button = new jbutton("2");     c.gridx = 1;     c.gridy = 1;     pane.add(button, c);      button = new jbutton("3");     c.gridx = 2;     c.gridy = 1;     pane.add(button, c);      button = new jbutton("4");     c.gridx = 0;     c.gridy = 2;     pane.add(button, c);      button = new jbutton("5");     c.gridx = 1;     c.gridy = 2;     pane.add(button, c);      button = new jbutton("6");     c.gridx = 2;     c.gridy = 2;     pane.add(button, c);      button = new jbutton("7");     c.gridx = 0;     c.gridy = 3;     pane.add(button, c);      button = new jbutton("8");     c.gridx = 1;     c.gridy = 3;     pane.add(button, c);      button = new jbutton("9");     c.gridx = 2;     c.gridy = 3;     pane.add(button, c);   }  public static void createandshowgui() {     jframe frame = new jframe("calculatorgui");     frame.setdefaultcloseoperation(jframe.exit_on_close);     addcomponentstopane(frame.getcontentpane());      frame.pack();     frame.setvisible(true); }  public static void main(string[] args) {     javax.swing.swingutilities.invokelater(new runnable() {         public void run() {             createandshowgui();         }     });   } }

i tried making label c.gridwidth = 3; same thing. when make width equal 1 buttons appear, label in in 1 cell. how make label span 3 columns? without making other buttons disappear.

how make label span 3 columns without gridwidth? 

c.gridwidth = 3;

you need reset 1 before adding other components.

so centered on '2' button

you need set text alignment of label:

label.sethorizontalalignment(jlabel.center);

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