GridLayout Java Swing Tutorial

Considered as one of the simplest layouts to implement, Grid Layout is all about placing your swing components in a Grid (Rectangular grid).

GridLayout Class has three constructors as follows:-

1. GridLayout() :- Allows you to create a grid layout having just a single column .
2. GridLayout(int row_count,into column_count) :- Creates a GridLayout as per the row_count and the column _column count supplied to it .
3. GridLayout(int row_count,int column_count,int horizontal_gap,int vertical_gap):- Creates a GridLayout as per the user inputted row_count,column_count,horizontal_gap and the vertical_gap.

package layouts;

import java.awt.GridLayout;

import javax.swing.*;

/**

*

* @author Pramod | http://techwayz.com

*/

public class GridLayoutDemo {

public static void main(String args[]) {

JFrame jf = new JFrame();

JPanel jp = new JPanel();

JPanel apanel = new JPanel();

JPanel buttonBox = new JPanel();

JPanel cbPanel = new JPanel();

jf.setTitle(“Grid Layout example”);

GridLayout gl = new GridLayout(4, 1);

jf.setLayout(gl);

jp.add(new JLabel(“Name”));

jp.add(new JTextField(20));

apanel.add(new JLabel(“Addrs”));

apanel.add(new JTextField(20));

cbPanel.add(new JLabel(“Sex ”));

cbPanel.add(new JComboBox(new Object[]{“Male”, “Female”}));

cbPanel.add(new JLabel(“Blood Group”));

cbPanel.add(new JComboBox(new Object[]{“O+”, “AB+”}));

buttonBox.add(new JButton(“Add”));

buttonBox.add(new JButton(“Update”));

jf.add(jp);

jf.add(apanel);

jf.add(cbPanel);

jf.add(buttonBox);

jf.setSize(300, 180);

jf.setLocation(300, 400);

jf.setResizable(false);

jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

jf.setVisible(true);

}

}

GridLayout gl = new GridLayout(4, 1):- In this line , we are passing row_count and the column_count to the GridLayout Constructor i.e 4 and 1 . So that Grid Layout class would setup and initialize the necessary code to create a rectangular Grid Layout with 1 column and 4 rows to hold our 4 different JPanels (JPanels containing the name , address, comboboxes and the button components)

I’ve used a single column and 4 different rows because I want my 4 JPanels to be placed one after the another (In 4 different rows)

jf.setLayout(gl) :- Without this line , you won’t be able to use the Grid Layout , this line tells the Layout Manager of your class to change your Layout from the default Layout to the one you’ve specified as a Parameter in the setLayout() method .

jf.add(jp) :- This line will place our name components of our form (i.e name JLabel and the associated text field) in the first row …as out of all the elements … we are adding the name components first .

jf.add(apanel):- This line will place our name components of our form (i.e name JLabel and the associated text field) in the second row our JFrame .

jf.add(cbPanel):- This line will place our name components of our form (i.e name JLabel and the associated text field) in the third row our JFrame …

jf.add(buttonBox):- :- This line will place our name components of our form (i.e name JLabel and the associated text field) in fourth row of our JFrame…