In this article, we will learn to determine when a Frame or Window is closing in Java. We will create a simple window in Java Swing titled "Demo". It displays styled text (italic, black on orange) using a text pane inside a scrollable area. The program also listens for window-closing events, printing a message when you close it. This basic example is how to build a GUI with text styling and event handling.Steps to determine when a Frame or Window is closing Following are the steps to determine when a Frame or Window is closing in Java − ... Read More

To determine when a Window is opened in Java, use the WindowListener, which is the listener interface for receiving window events..WindowListener listener = new WindowAdapter() {    public void windowOpened(WindowEvent evt) {       Frame frame = (Frame) evt.getSource();       System.out.println("Opened "+frame.getTitle());    } };Above, we have used the windowOpened() method, which is invoked when a window has been opened −public void windowOpened(WindowEvent evt) {    Frame frame = (Frame) evt.getSource();    System.out.println("Opened "+frame.getTitle()); }The following is an example to determine when a frame or window is opened in Java −Examplepackage my; import java.awt.BorderLayout; import java.awt.Color; import ... Read More

To set maximized bounds, use the setMaximizedBounds() method. Here, we will create a frame, which when maximized will form a shape −JFrame frame = new JFrame("Login!");Above, we have created a frame and now we will use the Rectangle class to specify an area of coordinates −Rectangle bounds = new Rectangle(50, 10, 100, 200); Now, set maximized bounds − frame.setMaximizedBounds(bounds);The following is an example to set the maximized bounds for a frame −Examplepackage my; import java.awt.GridLayout; import java.awt.Rectangle; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPasswordField; import javax.swing.JTextField; import javax.swing.SwingConstants; public class SwingDemo {    public static void main(String[] args) throws Exception { ... Read More

To disable the close button, let us first create a frame −JFrame frame = new JFrame("Login!");Use the setDefaultCloseOperation() to set the status of the close button. Set it to DO_NOTHING_ON_CLOSE to disable it −frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);The following is an example to disable close button on a JFrame in Java −Examplepackage my; import java.awt.GridLayout; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPasswordField; import javax.swing.JTextField; import javax.swing.SwingConstants; public class SwingDemo {    public static void main(String[] args) throws Exception {       JFrame frame = new JFrame("Login!");       JLabel label1, label2, label3;       frame.setLayout(new GridLayout(2, 2));       label1 = ... Read More

Position buttons vertically one after another using the Box class. Use the createVerticalBox() method that displays components from top to bottom −JButton button1 = new JButton("One"); JButton button2 = new JButton("Two"); JButton button3 = new JButton("Three"); Box box = Box.createVerticalBox(); box.add(button1); box.add(button2); box.add(button3);The following is an example to position buttons vertically one after another −Examplepackage my; import javax.swing.Box; import javax.swing.JButton; import javax.swing.JFrame; public class SwingDemo {    public static void main(String[] args) {       JButton button1 = new JButton("One");       JButton button2 = new JButton("Two");       JButton button3 = new JButton("Three");       ... Read More

To set the text of the label component to be right- justified and vertically centered, you need to set the alignment while creating a new label.Set the label to be on the right -JLabel label = new JLabel("Name", JLabel.RIGHT);Here, we have set the size of the label as well as the color that includes foreground and background color -label.setPreferredSize(new Dimension(170, 70)); label.setOpaque(true); label.setBackground(Color.MAGENTA); label.setForeground(Color.WHITE);The following is an example to set the text of the label to be right-justified and vertically centered −Examplepackage my; import java.awt.Color; import java.awt.Dimension; import java.awt.FlowLayout; import java.awt.Font; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JTextArea; import javax.swing.WindowConstants; public ... Read More

Use FlowLayout.LEFT to arrange components in a FlowLayout to be left-justified. The following is an example to arrange components in a FlowLayout to be left-justified −Examplepackage my; import java.awt.Color; import java.awt.Dimension; import java.awt.FlowLayout; import java.awt.Font; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JTextArea; import javax.swing.WindowConstants; public class SwingDemo {    public static void main(String[] args) {       JFrame frame = new JFrame("Internet Language");       frame.setLayout(new FlowLayout(FlowLayout.LEFT));       JLabel label = new JLabel("Top Internet Language");       label.setPreferredSize(new Dimension(240, 70));       label.setOpaque(true);       label.setBackground(Color.RED);       label.setForeground(Color.WHITE);       Font ... Read More

To simply set the content of the label horizontally and vertically centered, use the constant CENTER.JLabel label = new JLabel("Best IDE", JLabel.CENTER);The following is an example to set the content of the lable horizontally and verticaly centered −Examplepackage my; import java.awt.Color; import java.awt.Dimension; import java.awt.FlowLayout; import java.awt.Font; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JTextArea; import javax.swing.WindowConstants; public class SwingDemo {    public static void main(String[] args) {       JFrame frame = new JFrame("Frame");       frame.setLayout(new FlowLayout());       JLabel label = new JLabel("Best IDE", JLabel.CENTER);       label.setPreferredSize(new Dimension(190, 100));       label.setOpaque(true);   ... Read More

Set the alignment of the label’s content along the Y axis on the bottom, use the setVerticalAlignment() method and set the location. Let us first set a label component. We have set the label background color as well so that we can check the alignment of the label’s content properly  −JLabel label = new JLabel("Project Name"); label.setPreferredSize(new Dimension(190, 100)); label.setOpaque(true); label.setBackground(Color.GREEN); label.setForeground(Color.WHITE);Now, we will align the label content along the Y axis on the bottom by seeting location as BOTTOM −label.setVerticalAlignment(JLabel.BOTTOM);The following is an example to set the alignment of the label content along the Y axis in the bottom ... Read More

Use the createHorizontalStrut() method to create an invisible width component between two components. Let’s say we have some button and we are creating a fixed width between them −box.add(button4); box.add(Box.createHorizontalStrut(50)); box.add(button5); box.add(Box.createHorizontalStrut(30)); box.add(button6);The following is an example to create an invisible fixed width component between two components −Examplepackage my; import java.awt.BorderLayout; import javax.swing.Box; import javax.swing.BoxLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JScrollPane; public class SwingDemo {    public static void main(String args[]) {       JFrame frame = new JFrame("Groups");       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);       JButton button1 = new JButton("CSK");       JButton button2 = new JButton("DC"); ... Read More