Example: -
import java.awt.*;
import java.awt.event.*;
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.showFlowLayoutDemo();
}
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 TutorialsPoint AWT Tutorial.");
controlPanel = new Panel();
controlPanel.setLayout(new FlowLayout());
mainFrame.add(headerLabel);
mainFrame.add(controlPanel);
mainFrame.add(statusLabel);
mainFrame.setVisible(true);
}
private void showFlowLayoutDemo(){
headerLabel.setText("Layout in action: FlowLayout");
Panel panel = new Panel();
panel.setBackground(Color.darkGray);
panel.setSize(200,200);
FlowLayout layout = new FlowLayout();
layout.setHgap(10);
layout.setVgap(10);
panel.setLayout(layout);
panel.add(new Button("OK"));
panel.add(new Button("Cancel"));
controlPanel.add(panel);
mainFrame.setVisible(true);
}
}
Output: -
C:\java\awt>javac AwtLayoutDemo.java
C:\java\awt>java AwtLayoutDemo
4. GridLayoutt: - The GridLayout manages the components in form of a rectangular grid
Example: -
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 TutorialsPoint 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);
}
}Output: -
C:\java\awt>javac AwtLayoutDemo.java
C:\java\awt>java AwtLayoutDemo
5.GridBagLayout: - This is the most flexible layout manager class.The object of GridBagLayout aligns the component vertically,horizontally or along their baseline without requiring the components of same size
Example: -
import java.awt.*;
import java.awt.event.*;
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.showGridBagLayoutDemo();
}
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 TutorialsPoint AWT Tutorial.");
controlPanel = new Panel();
controlPanel.setLayout(new FlowLayout());
mainFrame.add(headerLabel);
mainFrame.add(controlPanel);
mainFrame.add(statusLabel);
mainFrame.setVisible(true);
}
private void showGridBagLayoutDemo(){
headerLabel.setText("Layout in action: GridBagLayout");
Panel panel = new Panel();
panel.setBackground(Color.darkGray);
panel.setSize(300,300);
GridBagLayout layout = new GridBagLayout();
panel.setLayout(layout);
GridBagConstraints gbc = new GridBagConstraints();
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.gridx = 0;
gbc.gridy = 0;
panel.add(new Button("Button 1"),gbc);
gbc.gridx = 1;
gbc.gridy = 0;
panel.add(new Button("Button 2"),gbc);
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.ipady = 20;
gbc.gridx = 0;
gbc.gridy = 1;
panel.add(new Button("Button 3"),gbc);
gbc.gridx = 1;
gbc.gridy = 1;
panel.add(new Button("Button 4"),gbc);
gbc.gridx = 0;
gbc.gridy = 2;
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.gridwidth = 2;
panel.add(new Button("Button 5"),gbc);
controlPanel.add(panel);
mainFrame.setVisible(true);
}
}
Output: -
C:\java\awt>javac AwtLayoutDemo.java
C:\java\awt>java AwtLayoutDemo
