GRIDLAYOUT

Introduction

The class GridLayout arranges the components in a rectangular grid.

Class Declaration

Following is the declaration for java.awt.GridLayout class −

public class GridLayout
   extends Object
      implements LayoutManager, Serializable

Class Constructors

Sr.No.	Constructor & Description
1	GridLayout() Creates a grid layout with a default of one column per component, in a single row.
2	GridLayout(int rows, int cols) Creates a grid layout with the specified number of rows and columns.
3	GridLayout(int rows, int cols, int hgap, int vgap) Creates a grid layout with the specified number of rows and columns.

Class Methods

Sr.No.	Method & Description
1	void addLayoutComponent(String name, Component comp) Adds the specified component with the specified name to the layout.
2	int getColumns() Gets the number of columns in this layout.
3	int getHgap() Gets the horizontal gap between the components.
4	int getRows() Gets the number of rows in this layout.
5	int getVgap() Gets the vertical gap between the components.
6	void layoutContainer(Container parent) Lays out the specified container using this layout.
7	Dimension minimumLayoutSize(Container parent) Determines the minimum size of the container argument using this grid layout.
8	Dimension preferredLayoutSize(Container parent) Determines the preferred size of the container argument using this grid layout.
9	void removeLayoutComponent(Component comp) Removes the specified component from the layout.
10	void setColumns(int cols) Sets the number of columns in this layout to the specified value.
11	void setHgap(int hgap) Sets the horizontal gap between the components to the specified value.
12	void setRows(int rows) Sets the number of rows in this layout to the specified value.
13	void setVgap(int vgap) Sets the vertical gap between the components to the specified value.
14	String toString() Returns the string representation of this grid layout's values.

Methods Inherited

This class inherits methods from the following class −

• java.lang.Object

GridLayout Example

Create the following Java program using any editor of your choice in say D:/ > SWING > com > sjavaspot > gui >

SwingLayoutDemo.java

import javax.swing.*;

public class SwingLayoutDemo {
   private JFrame mainFrame;
   private JLabel headerLabel;
   private JLabel statusLabel;
   private JPanel controlPanel;
   private JLabel msglabel;
   
   public SwingLayoutDemo(){
      prepareGUI();
   }
   public static void main(String[] args){
      SwingLayoutDemo swingLayoutDemo = new SwingLayoutDemo();  
      swingLayoutDemo.showGridLayoutDemo();       
   }
   private void prepareGUI(){
      mainFrame = new JFrame("Java SWING Examples");
      mainFrame.setSize(400,400);
      mainFrame.setLayout(new GridLayout(3, 1));

      headerLabel = new JLabel("",JLabel.CENTER );
      statusLabel = new JLabel("",JLabel.CENTER);        
      statusLabel.setSize(350,100);
      
      mainFrame.addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent windowEvent){
            System.exit(0);
         }        
      });    
      controlPanel = new JPanel();
      controlPanel.setLayout(new FlowLayout());

      mainFrame.add(headerLabel);
      mainFrame.add(controlPanel);
      mainFrame.add(statusLabel);
      mainFrame.setVisible(true);  
   }
   private void showGridLayoutDemo(){
      headerLabel.setText("Layout in action: GridLayout");      
      
      JPanel panel = new JPanel();
      panel.setBackground(Color.darkGray);
      panel.setSize(300,300);
      GridLayout layout = new GridLayout(0,3);
      layout.setHgap(10);
      layout.setVgap(10);
      
      panel.setLayout(layout);        
      panel.add(new JButton("Button 1"));
      panel.add(new JButton("Button 2")); 
      panel.add(new JButton("Button 3")); 
      panel.add(new JButton("Button 4")); 
      panel.add(new JButton("Button 5")); 
      controlPanel.add(panel);
      mainFrame.setVisible(true);  
   }
}

THE OUTPUT:

ANOTHER CODE FOR GRIDLAYOUT

import java.awt.*;  
import javax.swing.*;  
  
public class MyGridLayout{  
JFrame f;  
MyGridLayout(){  
    f=new JFrame();  
      
    JButton b1=new JButton("1");  
    JButton b2=new JButton("2");  
    JButton b3=new JButton("3");  
    JButton b4=new JButton("4");  
    JButton b5=new JButton("5");  
        JButton b6=new JButton("6");  
        JButton b7=new JButton("7");  
    JButton b8=new JButton("8");  
        JButton b9=new JButton("9");  
          
    f.add(b1);f.add(b2);f.add(b3);f.add(b4);f.add(b5);  
    f.add(b6);f.add(b7);f.add(b8);f.add(b9);  
  
    f.setLayout(new GridLayout(3,3));  
    //setting grid layout of 3 rows and 3 columns  
  
    f.setSize(300,300);  
    f.setVisible(true);  
}  
public static void main(String[] args) {  
    new MyGridLayout();  
}  
}  

THE OUTPUT:

ANOTHER CODE FOR GRIDLAYOUT

import java.awt.GridLayout;

import javax.swing.JButton;
import javax.swing.JFrame;

public class GridLayoutTest {

  public static void main(String[] args) {
    JFrame.setDefaultLookAndFeelDecorated(true);
    JFrame frame = new JFrame("GridLayout Test");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setLayout(new GridLayout(3, 2));
    frame.add(new JButton("Button 1"));
    frame.add(new JButton("Button 2"));
    frame.add(new JButton("Button 3"));
    frame.add(new JButton("Button 4"));
    frame.add(new JButton("Button 5"));
    frame.add(new JButton("Button 6"));
    frame.add(new JButton("Button 7"));
    frame.add(new JButton("Button 8"));
    frame.pack();
    frame.setVisible(true);
  }
}

THE OUTPUT: