GRIDBAGLAYOUT AND ITS INTERNAL METHODS AND OPTATIONS IMPLEMENTATION

http://docs.oracle.com/javase/tutorial/uiswing/layout/visual.htmlfor the scenarios of all the layouts in java click the below link  follow the net beans tool
http://docs.oracle.com/javase/tutorial/uiswing/layout/visual.html

IN THIS CODE I HAVE EXPLAINED GRIDBAG LAYOUT BY DIVIDING A FRAME INTO 3 PARTS IN THE FIRST ROW I PLACED 3 BUTTON 2^ND ROW ONLY BUTTON4 IN THE 3^RD ROW FROM MIDDLE LOCATION TO THE RIGHT END I PLACED THE BUTTON5

import java.awt.*;

import javax.swing.*;

class gbagdemo extends JFrame

{

GridBagLayout gbag;

GridBagConstraints cons;

gbagdemo()

{

Container c=getContentPane();

gbag=new GridBagLayout();

c.setLayout(gbag);

JButton b1=new JButton("Button1");

JButton b2=new JButton("Button2");

JButton b3=new JButton("Button3");

JButton b4=new JButton("Button4");

JButton b5=new JButton("Button5");

cons=new GridBagConstraints();

cons.fill=GridBagConstraints.HORIZONTAL;

cons.gridx=0;

cons.gridy=0;

cons.weightx=0.7;

gbag.setConstraints(b1,cons);

c.add(b1);

cons.gridx=1;

cons.gridy=0;

gbag.setConstraints(b2,cons);

c.add(b2);

cons.gridx=2;

cons.gridy=0;

gbag.setConstraints(b3,cons);

c.add(b3);

cons.gridx=0;

cons.gridy=1;

cons.ipady=100;

cons.gridwidth=3;

gbag.setConstraints(b4,cons);

c.add(b4);

cons.gridx=1;

cons.gridy=2;

cons.ipady=0;

cons.weighty=1.0;

cons.anchor=GridBagConstraints.PAGE_END;

cons.gridwidth=2;

gbag.setConstraints(b5,cons);

c.add(b5);

}

public static void main(String args[])

{gbagdemo demo=new gbagdemo();

demo.setSize(800,400);

demo.show();

}}

program-2

IN THIS PROGRAM I CONCENTRATED ABOUT THE SOME ADDITIONAL METHODS FOR THE LAYOUT IMPLEMENTATIONS

import java.awt.*;   

import javax.swing.*;

class boxdemo extends JFrame

{

boxdemo()

{

JLabel l1=new JLabel("enter name");

JTextField t1=new JTextField(20);

t1.setMaximumSize(t1.getPreferredSize());

Box h1=Box.createHorizontalBox();

h1.add(l1);

h1.add(Box.createHorizontalStrut(20));

h1.add(t1);

JLabel l2=new JLabel("enter password");

JTextField t2=new JTextField(20);

t2.setMaximumSize(t2.getPreferredSize());

Box h2=Box.createHorizontalBox();

h2.add(l2);

h2.add(Box.createHorizontalStrut(20));

h2.add(t2);

JButton b1=new JButton("ok");

JButton b2=new JButton("cancel");

Box h3=Box.createHorizontalBox();

h3.add(b1);

h3.add(Box.createGlue());

h3.add(b2);

Box v=Box.createVerticalBox();

v.add(h1);

v.add(Box.createVerticalStrut(200));

v.add(h2);

v.add(Box.createVerticalStrut(200));

v.add(h3);

Container c=getContentPane();

c.add(v);

}

public static void main(String args[])

{

boxdemo bd=new boxdemo();

bd.setSize(500,400);

bd.show();

}}

output:-

If u runs this program it will produce the output with center two labels and text feilds and at the bottom two corners two buttons like OK, cancel