layout - Problems implementing GridBagLayout in Java -


i trying implement gridbaglayout in java sign in dialog have make program building. going clean google sign in. main issue having constraints have set using gridbagconstraints not working. here dialog like.

a simple sign in dialog using java

and here code dialog trying implement.

import javax.swing.*; import java.awt.*; import java.awt.event.*;  public class login_dialog extends jdialog{      // setting required components sign in      /**      *       */     private static final long serialversionuid = 1l;       protected jlabel username_label = new jlabel("username");     protected jlabel password_label = new jlabel("username");      protected jtextfield username_field = new jtextfield(30);     protected jtextfield password_field = new jtextfield(30);      protected jbutton sign_in = new jbutton("sign in!");      public login_dialog() {         setsize(600,400);         settitle("sign in");          setlayout(new gridbaglayout());          gridbagconstraints c = new gridbagconstraints();          c.fill = gridbagconstraints.horizontal;         c.gridx = 0;         c.gridy = 0;          add(username_label);          c.fill = gridbagconstraints.horizontal; //      c.weightx = 0.5;         c.gridx = 1;         c.gridy = 0;          add(username_field);          c.fill = gridbagconstraints.horizontal;         c.weightx = 0.5;         c.gridx = 0;         c.gridy = 2;          add(password_label);          c.fill = gridbagconstraints.horizontal;         c.weightx = 0.5;         c.gridx = 0;         c.gridy = 4;          add(password_field);          c.fill = gridbagconstraints.horizontal;         c.weightx = 0.5;         c.gridx = 0;         c.gridy = 5;          add(sign_in);          setvisible(true);      }  }

update:

i have made changes , seems reaching desired result. issue centred , length of button wide. also, textfield , label bigger.

here updated gridbaglayout

//cusotmization of buttons         dimension signd = sign_in.getpreferredsize();         signd.height = 50;         signd.width = 30;          sign_in.setpreferredsize(signd);           gridbagconstraints c = new gridbagconstraints();          c.fill = gridbagconstraints.horizontal;         c.gridx = 0;         c.gridy = 0;          add(username_label,c);          c.fill = gridbagconstraints.horizontal; //      c.weightx = 0.5;         c.gridx = 0;         c.gridy = 1;          add(username_field,c);          c.fill = gridbagconstraints.horizontal; //      c.weightx = 0.5;         c.gridx = 0;         c.gridy = 2;          add(password_label,c);          c.fill = gridbagconstraints.horizontal; //      c.weightx = 0.5;         c.gridx = 0;         c.gridy = 3;          add(password_field,c); //       //      c.fill = gridbagconstraints.horizontal; //      c.weightx = 0.5;         c.gridx = 0;         c.gridy = 5; //               add(sign_in,c);

you have add constraint object in add()

example :

add(username_field, c);

where c gridbagconstraints.

here full example :

package gui;  import java.awt.dimension; import java.awt.eventqueue; import java.awt.gridbagconstraints; import java.awt.gridbaglayout; import java.awt.insets;  import javax.swing.jbutton; import javax.swing.jdialog; import javax.swing.jlabel; import javax.swing.jpanel; import javax.swing.jtextfield; import javax.swing.windowconstants;  @suppresswarnings("serial") public class loginpanel extends jpanel {     private static final dimension tfield_sz = new dimension(120, 20);      public loginpanel()     {         super(new gridbaglayout());          final gridbagconstraints cst = new gridbagconstraints();         cst.insets = new insets(0, 5, 0, 5);         cst.weightx = 0.5;         cst.weighty = 0.5;         cst.anchor = gridbagconstraints.line_start;          // username         cst.gridx = 0;         cst.gridy = 0;         this.add(new jlabel("username:"), cst);         cst.gridy = 1;         cst.gridwidth = 2;         final jtextfield utfield = new jtextfield();         utfield.setminimumsize(tfield_sz);         utfield.setpreferredsize(tfield_sz);         this.add(utfield, cst);          // password         cst.gridwidth = 1;         cst.gridy = 2;         this.add(new jlabel("password:"), cst);         cst.gridy = 3;         cst.gridwidth = 2;         final jtextfield pwtfield = new jtextfield();         pwtfield.setminimumsize(tfield_sz);         pwtfield.setpreferredsize(tfield_sz);         this.add(pwtfield, cst);          // buttons         cst.anchor = gridbagconstraints.center;         cst.gridy = 4;         cst.gridwidth = 1;         this.add(new jbutton("sign in"), cst);         cst.gridx = 1;         this.add(new jbutton("sign up"), cst);      }      public static void main(final string[] args)     {         eventqueue.invokelater(new runnable()         {             @override             public void run()             {                 final jdialog mydialog = new jdialog();                 mydialog.settitle("sign in");                 mydialog.setsize(180, 170);                 mydialog.setcontentpane(new loginpanel());                 mydialog.setdefaultcloseoperation(windowconstants.dispose_on_close);                 mydialog.setvisible(true);             }         });     } }

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