Java awt event windowadapter windowclosing

Java WindowAdapter .windowClosing (WindowEvent e)

WindowAdapter.windowClosing(WindowEvent e) has the following syntax.

public void windowClosing(WindowEvent e) 

Example

In the following code shows how to use WindowAdapter.windowClosing(WindowEvent e) method.

 import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import javax.swing.JFrame; public class Main < JFrame window = new JFrame("Main"); public Main() < window.setBounds(30, 30, 300, 300);/*from www.ja v a2s. c om*/ window.addWindowListener(new WindowHandler()); window.setVisible(true); > class WindowHandler extends WindowAdapter < public void windowClosing(WindowEvent e) < System.out.println("windowClosing"); window.dispose(); // Release the window resources System.exit(0); // End the application > > public static void main(String[] args) < new Main(); > > 

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How do I handle a window closing event in Swing?

Here you will see how to handle the window closing event of a JFrame . What you need to do is to implement a java.awt.event.WindowListener interface and call the frame addWindowListener() method to add the listener to the frame instance. To handle the closing event implements the windowClosing() method of the interface.

Instead of implementing the java.awt.event.WindowListener interface which require us to implement the entire methods defined in the interface, we can create an instance of WindowAdapter object and override only the method we need, which is the windowsClosing() method. Let’s see the code snippet below.

package org.kodejava.swing; import javax.swing.JFrame; import java.awt.Button; import java.awt.Dimension; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; public class WindowClosingDemo extends JFrame < public static void main(String[] args) < WindowClosingDemo frame = new WindowClosingDemo(); frame.setSize(new Dimension(500, 500)); frame.add(new Button("Hello World")); // Add window listener by implementing WindowAdapter class to // the frame instance. To handle the close event we just need // to implement the windowClosing() method. frame.addWindowListener(new WindowAdapter() < @Override public void windowClosing(WindowEvent e) < System.out.println("WindowClosingDemo.windowClosing"); System.exit(0); >>); // Show the frame frame.setVisible(true); > > 

A programmer, recreational runner and diver, live in the island of Bali, Indonesia. Programming in Java, Spring, Hibernate / JPA. You can support me working on this project, buy me a cup of coffee ☕ every little bit helps, thank you 🙏

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AWT WindowAdapter Class

The class WindowAdapter is an abstract (adapter) class for receiving window events. All methods of this class are empty. This class is convenience class for creating listener objects.

Class declaration

Following is the declaration for java.awt.event.WindowAdapter class:

public abstract class WindowAdapter extends Object implements WindowListener, WindowStateListener, WindowFocusListener

Class constructors

Class methods

void windowActivated(WindowEvent e)

Invoked when a window is activated.

void windowClosed(WindowEvent e)

Invoked when a window has been closed.

void windowClosing(WindowEvent e)

Invoked when a window is in the process of being closed.

void windowDeactivated(WindowEvent e)

Invoked when a window is de-activated.

void windowDeiconified(WindowEvent e)

Invoked when a window is de-iconified.

void windowGainedFocus(WindowEvent e)

Invoked when the Window is set to be the focused Window, which means that the Window, or one of its subcomponents, will receive keyboard events.

void windowIconified(WindowEvent e)

Invoked when a window is iconified.

void windowLostFocus(WindowEvent e)

Invoked when the Window is no longer the focused Window, which means that keyboard events will no longer be delivered to the Window or any of its subcomponents.

void windowOpened(WindowEvent e)

Invoked when a window has been opened.

void windowStateChanged(WindowEvent e)

Invoked when a window state is changed.

Methods inherited

This class inherits methods from the following classes:

WindowAdapter Example

Create the following java program using any editor of your choice in say D:/ > AWT > com > tutorialspoint > gui >

package com.tutorialspoint.gui; import java.awt.*; import java.awt.event.*; public class AwtAdapterDemo < private Frame mainFrame; private Label headerLabel; private Label statusLabel; private Panel controlPanel; public AwtAdapterDemo()< prepareGUI(); >public static void main(String[] args) < AwtAdapterDemo awtAdapterDemo = new AwtAdapterDemo(); awtAdapterDemo.showWindowAdapterDemo(); >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); controlPanel = new Panel(); controlPanel.setLayout(new FlowLayout()); mainFrame.add(headerLabel); mainFrame.add(controlPanel); mainFrame.add(statusLabel); mainFrame.setVisible(true); > private void showWindowAdapterDemo() < headerLabel.setText("Listener in action: WindowAdapter"); Button okButton = new Button("OK"); final Frame aboutFrame = new Frame(); aboutFrame.setSize(300,200);; aboutFrame.setTitle("WindowAdapter Demo"); aboutFrame.addWindowListener(new WindowAdapter() < public void windowClosing(WindowEvent windowEvent)< aboutFrame.dispose(); >>); Label msgLabel = new Label("Welcome to tutorialspoint."); msgLabel.setAlignment(Label.CENTER); msgLabel.setSize(100,100); aboutFrame.add(msgLabel); aboutFrame.setVisible(true); > >

Compile the program using command prompt. Go to D:/ > AWT and type the following command.

D:\AWT>javac com\tutorialspoint\gui\AwtAdapterDemo.java

If no error comes that means compilation is successful. Run the program using following command.

D:\AWT>java com.tutorialspoint.gui.AwtAdapterDemo

Verify the following output

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SWING — WindowAdapter Class

The class WindowAdapter is an abstract (adapter) class for receiving window events. All methods of this class are empty. This class is convenience class for creating listener objects.

Class Declaration

Following is the declaration for java.awt.event.WindowAdapter class −

public abstract class WindowAdapter extends Object implements WindowListener, WindowStateListener, WindowFocusListener

Class Constructors

Class Methods

void windowActivated(WindowEvent e)

Invoked when a Window is activated.

void windowClosed(WindowEvent e)

Invoked when a Window has been closed.

void windowClosing(WindowEvent e)

Invoked when a Window is in the process of being closed.

void windowDeactivated(WindowEvent e)

Invoked when a Window is de-activated.

void windowDeiconified(WindowEvent e)

Invoked when a Window is de-iconified.

void windowGainedFocus(WindowEvent e)

Invoked when the Window is set to be the focused Window, which means that the Window, or one of its subcomponents, will receive keyboard events.

void windowIconified(WindowEvent e)

Invoked when a Window is iconified.

void windowLostFocus(WindowEvent e)

Invoked when the Window is no longer the focused Window, which means that keyboard events will no longer be delivered to the Window or any of its subcomponents.

void windowOpened(WindowEvent e)

Invoked when a Window has been opened.

void windowStateChanged(WindowEvent e)

Invoked when a Window state is changed.

Methods Inherited

This class inherits methods from the following classes −

WindowAdapter Example

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

package com.tutorialspoint.gui; import java.awt.*; import java.awt.event.*; public class SwingAdapterDemo < private JFrame mainFrame; private JLabel headerLabel; private JLabel statusLabel; private JPanel controlPanel; public SwingAdapterDemo()< prepareGUI(); >public static void main(String[] args) < SwingAdapterDemo swingAdapterDemo = new SwingAdapterDemo(); swingAdapterDemo.showWindowAdapterDemo(); >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 showWindowAdapterDemo() < headerLabel.setText("Listener in action: WindowAdapter"); JButton okButton = new JButton("OK"); final JFrame aboutFrame = new JFrame(); aboutFrame.setSize(300,200);; aboutFrame.setTitle("WindowAdapter Demo"); aboutFrame.addWindowListener(new WindowAdapter() < public void windowClosing(WindowEvent windowEvent)< aboutFrame.dispose(); >>); JLabel msglabel = new JLabel("Welcome to TutorialsPoint SWING Tutorial.",JLabel.CENTER); aboutFrame.add(msgLabel); aboutFrame.setVisible(true); > >

Compile the program using the command prompt. Go to D:/ > SWING and type the following command.

D:\SWING>javac com\tutorialspoint\gui\SwingAdapterDemo.java

If no error occurs, it means the compilation is successful. Run the program using the following command.

D:\SWING>java com.tutorialspoint.gui.SwingAdapterDemo

Verify the following output.

Источник

How do I handle a window closing event in Swing?

Here you will see how to handle the window closing event of a JFrame . What you need to do is to implement a java.awt.event.WindowListener interface and call the frame addWindowListener() method to add the listener to the frame instance. To handle the closing event implements the windowClosing() method of the interface.

Instead of implementing the java.awt.event.WindowListener interface which require us to implement the entire methods defined in the interface, we can create an instance of WindowAdapter object and override only the method we need, which is the windowsClosing() method. Let’s see the code snippet below.

package org.kodejava.swing; import javax.swing.JFrame; import java.awt.Button; import java.awt.Dimension; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; public class WindowClosingDemo extends JFrame < public static void main(String[] args) < WindowClosingDemo frame = new WindowClosingDemo(); frame.setSize(new Dimension(500, 500)); frame.add(new Button("Hello World")); // Add window listener by implementing WindowAdapter class to // the frame instance. To handle the close event we just need // to implement the windowClosing() method. frame.addWindowListener(new WindowAdapter() < @Override public void windowClosing(WindowEvent e) < System.out.println("WindowClosingDemo.windowClosing"); System.exit(0); >>); // Show the frame frame.setVisible(true); > > 

A programmer, recreational runner and diver, live in the island of Bali, Indonesia. Programming in Java, Spring, Hibernate / JPA. You can support me working on this project, buy me a cup of coffee ☕ every little bit helps, thank you 🙏

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