Introduction
The class GridLayout arranges 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
| S.N. | 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
| S.N. | 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 components. |
| 4 | int getRows()Gets the number of rows in this layout. |
| 5 | int getVgap()Gets the vertical gap between 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 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 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 classes:
- java.lang.Object
GridLayout Example
Create the following java program using any editor of your choice in say D:/ > AWT > com > adglob > gui >AwtLayoutDemo.java
package com.adglob.gui;
import java.awt.*;
import java.awt.event.*;
public class AwtLayoutDemo {
private Frame mainFrame;
private Label headerLabel;
private Label statusLabel;
private Panel controlPanel;
private Label msglabel;
public AwtLayoutDemo(){
prepareGUI();
}
public static void main(String[] args){
AwtLayoutDemo awtLayoutDemo = new AwtLayoutDemo();
awtLayoutDemo.showGridLayoutDemo();
}
private void prepareGUI(){
mainFrame = new Frame("Java AWT Examples");
mainFrame.setSize(400,400);
mainFrame.setLayout(new GridLayout(3, 1));
mainFrame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent windowEvent){
System.exit(0);
}
});
headerLabel = new Label();
headerLabel.setAlignment(Label.CENTER);
statusLabel = new Label();
statusLabel.setAlignment(Label.CENTER);
statusLabel.setSize(350,100);
msglabel = new Label();
msglabel.setAlignment(Label.CENTER);
msglabel.setText("Welcome to Adglob AWT Tutorial.");
controlPanel = new Panel();
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");
Panel panel = new Panel();
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 Button("Button 1"));
panel.add(new Button("Button 2"));
panel.add(new Button("Button 3"));
panel.add(new Button("Button 4"));
panel.add(new Button("Button 5"));
controlPanel.add(panel);
mainFrame.setVisible(true);
}
}
Compile the program using command prompt. Go to D:/ > AWT and type the following command.
D:\AWT>javac com\adglob\gui\AwtlayoutDemo.java
If no error comes that means compilation is successful. Run the program using following command.
D:\AWT>java com.adglob.gui.AwtlayoutDemo
Verify the following output
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