GridLayout Instance Code (Notepad)

Import java.awt.*;
Import javax.swing.*;

public class Gridbagdemo extends JFrame {
public static void Main (String args[]) {
Gridbagdemo demo = new Gridbagdemo ();
}

Public Gridbagdemo () {
init ();
this.setsize (600,600);
this.setvisible (true);
}
Public void Init () {
J1 = new JButton ("open");
J2 = new JButton ("Save");
J3 = new JButton ("Save As");
J4 = new JPanel ();
string[] str = {"Java notes", "C # Notes", "HTML5 Notes"};
J5 = new JComboBox (str);
J6 = new JTextField ();
J7 = new JButton ("Empty");
J8 = new JList (str);
J9 = new JTextArea ();
J9.setbackground (Color.pink);//To see the effect, set the color
gridbaglayout layout = new GridBagLayout ();
this.setlayout (layout);
This.add (J1);//Add components into the JFrame
This.add (J2);
This.add (J3);
This.add (J4);
This.add (J5);
This.add (J6);
This.add (J7);
This.add (J8);
This.add (J9);
gridbagconstraints s= New gridbagconstraints ();//define a gridbagconstraints,
//is used to control the display position of the added component
S.fill = Gridbagconstraints.both;
//This method is to set the display if the area of the component is larger than the component itself
//none: The component size is not resized.
//horizontal: Widens the component so that it fills its display area horizontally, but does not change the height.
//vertical: The heightening component, which fills its display area vertically, but does not change the width.
//both: Causes the component to fully fill its display area.
s.gridwidth=1;//The method is to set the number of squares occupied by the component level, if 0, it means that the component is the last of the row
s.weightx = 0;//The method sets the horizontal stretch amplitude of the component, if 0 means no stretch, not 0 stretches as the window grows, between 0 and 1
s.weighty=0;//This method sets the vertical stretch amplitude of the component, if 0 means no stretch, not 0 stretches as the window grows, between 0 and 1
layout.setconstraints (J1, s);//Set up components
s.gridwidth=1;
s.weightx = 0;
s.weighty=0;
layout.setconstraints (J2, s);
s.gridwidth=1;
s.weightx = 0;
s.weighty=0;
layout.setconstraints (J3, s);
s.gridwidth=0;//The method is to set the number of squares occupied by the component level, if 0, it means that the component is the last of the row
S.WEIGHTX = 0;//cannot be 4 of a 1,j4, and can be stretched horizontally,
//But if 1, the column of the subsequent row will also be stretched, causing the column where the J7 is to be stretched
//So it should be stretched along with J6
s.weighty=0;
layout.setconstraints (J4, s)
; s.gridwidth=2;
s.weightx = 0;
s.weighty=0;
layout.setconstraints (J5, s);
; s.gridwidth=4;
s.weightx = 1;
s.weighty=0;
layout.setconstraints (J6, s);
; s.gridwidth=0;
s.weightx = 0;
s.weighty=0;
layout.setconstraints (J7, s);
; s.gridwidth=2;
s.weightx = 0;
S.weighty=1;
layout.setconstraints (J8, s);
; s.gridwidth=5;
s.weightx = 0;
S.weighty=1;
layout.setconstraints (J9, s);
}
JButton J1;
JButton J2;
JButton J3;
JPanel J4;
JComboBox J5;
JTextField J6;
JButton J7;
JList J8;
JTextArea J9;
}

GridLayout Instance Code (Notepad)