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Articles by Alshifa Hasnain
Page 7 of 23
How can we show/hide the table header of a JTable in Java?
While using JTables in Java Swing, you may have cases where you would require displaying or hiding the column headers dynamically. In this article, we will learn how to show/hide the table header of a JTable in Java. JTable A JTable is a subclass of the JComponent class for displaying complex data structures. A JTable can follow the Model View Controller (MVC) design pattern to display the data in rows and columns. DefaultTableModel The DefaultTableModel class is a subclass of AbstractTableModel, and it can be used to add rows and columns to a JTable dynamically. The DefaultTableCellRenderer class can ...
Read MoreHow can we insert multiple tabs into a single JTabbedPane in Java?
In this article, we will learn to insert multiple tabs into a single JTabbedPane in Java. The Java Swing's JTabbedPane enables you to group content into several tabs in one container. JTabbedPane A JTabbedPane is a component can extends the JComponent class, and we can able to see only one tab at a time. Each tab is associated with a single component that can be displayed when the tab is selected. Syntax Object declaration and instantiation using the Java class JTabbedPane: JTabbedPane tabbedPane = new JTabbedPane(); A JTabbedPane can generate a ChangeListener interface when a tab is ...
Read MoreHow can we prevent the re-ordering columns of a JTable in Java?
JTable component in Swing provides an effective method for showing and editing tabular information. JTable automatically supports re-ordering columns through dragging of column headers by default. In this article, we will learn to prevent the re-ordering of columns of a JTable in Java. JTable A JTable is a subclass of the JComponent class, and it can be used to create a table with information displayed in multiple rows and columns. Syntax The following is the syntax for JTable initialization: JTable table = new JTable(data, columnNames); When a value is selected from a JTable, a TableModelEvent is generated, which is handled ...
Read MoreHow to display a bold text inside the JTextArea in Java?\\n
JTextArea is one of the most common Swing-based components. By default, it does not support text formatting such as bold, italics, or colored text inside a textarea. In this article, we will learn to display bold text inside the JTextArea in Java. What is a JTextArea? A JTextArea class can extend JTextComponent and allow a user to enter multiple lines of text inside it. A JTextArea can generate a CaretListener interface, which can listen to caret update events. Syntax The following is the syntax for JTextArea initialization: JTextArea textArea = new JTextArea(); Adding Bold Text Inside the JTextArea We ...
Read MoreHow can we implement an editable JLabel in Java?\\n
In this article, we will learn to implement an editable JLabel in Java. An editable JLabel is a label component that can be converted to an editable text field when clicked. JLabel A JLabel class can extend the JComponent class, and an object of JLabel provides text instructions or information on a GUI. A JLabel can display a single line of read-only text, an image, or both text and image. Syntax The following is the syntax for JLabel initialization: JLabel label = new JLabel("Tutorials Point"); A JLabel can explicitly generate a PropertyChangeListener interface. Methods The important methods of a ...
Read MoreHow can we set the margin to a JButton in Java?
While developing Java Swing applications, you may have cases when you need to modify the space around JButtons to develop attractive applications. In this article, we will learn to set the margin of a JButton in Java. What is a JButton? A JButton is a subclass of AbstractButton, and it can be used for adding platform-independent buttons to a Java Swing application. A Button can generate an ActionListener interface when the button is pressed or clicked, it can also generate the MouseListener and KeyListener interfaces. Syntax The following is the syntax for JButton initialization: JButton button = new JButton("Button"); We ...
Read MoreHow can we implement a long text of the JOptionPane message dialog in Java?
When you have to show long text messages, you might find problems with the dialog becoming too big or the text getting cut off. In this article, we will learn to implement a long text of the JOptionPane message dialog in Java. What is a JOptionPane? A JOptionPane is a subclass of the JComponent class, which includes static methods for creating and customizing modal dialog boxes. A JOptionPane class can be used instead of a JDialog class to minimize the complexity of the code. Syntax The following is the syntax for JOptionPane initialization: JOptionPane.showMessageDialog(null, "Tutorials Point"); The JOptionPane displays the ...
Read MoreHow to select one item at a time from JCheckBox in Java?
In this article, we will learn to select one item at a time from a JCheckBox in Java. When creating Java Swing applications, you might have situations where you need checkboxes to behave like radio buttons, such that a box can be checked singly at any given time. JCheckBox A JCheckBox can extend JToggleButton, and it can be a small box that is either checked or unchecked. When we click on a JCheckBox, it changes from checked to unchecked or vice versa automatically. Syntax The following is the syntax for JCheckBox initialization: JCheckBox checkBox = new JCheckBox("Option"); A JCheckBox can ...
Read MoreHow can we set the background color to a JPanel in Java?
In this article, we will learn to set the background color of a JPanel in Java. When designing GUIs in Swing, changing the background color of panels is important for creating visually appealing applications. What is a JPanel? A JPanel is a container, and it is an invisible component in Java. The FlowLayout is a default layout for a JPanel. We can add most of the components, like buttons, text fields, labels, tables, lists, trees, etc., into a JPanel. Syntax The following is the syntax for JPanel initialization: JPanel panel = new JPanel(); Methods The important methods of JPanel are: ...
Read MoreHow can we make JTextField accept only numbers in Java?
In this article, we will learn to make a JTextField accept only numbers in Java. By default, a JTextField can allow numbers, characters, and special characters. Validating user input that is typed into a JTextField can be difficult, especially if the input string must be converted to a numeric value such as an int. Different Approaches The following are the two different approaches for making a JTextField accept only numbers in Java: Using a KeyListener Using DocumentFilter Using a KeyListener The KeyListener interface handles keyboard events, making it straightforward to ...
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