Programming Articles - Page 2533 of 3366

In this article, we will learn to implement a rounded JTextField in Java. The JtextField is rectangular in shape, and to create a custom JTextField with rounded corners, we will use the RoundRectangle2D class and with the help of fillRoundRect() and drawRoundRect() methods in Java Swing. What is a JTextField? A JTextField is a subclass of the JTextComponent class, and it is one of the most important components that allows the user to an input text value in a single-line format.  Below is the graphical representation of a JTextField:  A JTextField class will generate an ActionListener interface when we ... Read More

In this article, we will learn to sort a JTable on a particular column in Java. Data sorting in a JTable is something that most Java Swing applications require. If the users can sort table data by clicking on column headers, it improves the experience greatly. What is a JTable? A JTable is a subclass of JComponent class for displaying complex data structures. A JTable component can follow the Model View Controller (MVC) design pattern for displaying the data in rows and columns. Syntax The following is the syntax: JTable table = new JTable(data, columnNames); A JTable can generate different ... Read More

In this article, we will learn to show/hide the echo character of a JPasswordField in Java. The password in this will be hidden with *. And we will be using the setEchoChar() method to toggle between hidden and visible text in a Swing based application. What is a JPasswordField? A JPasswordField is a subclass of JTextField, and each character entered in a JPasswordField can be replaced by an echo character. This allows confidential input for passwords. By default, the echo character is the asterisk(*). The important methods of JPasswordField are get password(), getText(), getAccessibleContext() and etc. What is the echo ... Read More

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 More

In this article, we will learn to display the different font items inside a JComboBox in Java. The Swing framework provides a powerful JComboBox component that allows users to select an object from a drop-down list. What is a JComboBox? A JComboBox is a subclass of the JComponent class, and it is a combination of a text field and a drop-down list from which the user can choose a value. A JComboBox can generate an ActionListener, ChangeListener, and ItemListener interfaces when the user interacts with a combo box. Syntax The following is the syntax: JComboBox Box_Name = new JComboBox(array); Problem ... Read More

In this article, we will learn to set a tooltip text for each item of a JList in Java. Tooltips give meaningful information as users hover over UI components. Swing's JList does not support tooltips on a per-item basis, so it will involve some customization. What is JList? A JList is a subclass of the JComponent class, and it can be used to display a list of objects that allows the user to select one or more items. A JList can generate a ListSelectionListener interface and needs to implement the abstract method valueChanged(). Syntax The following is the syntax for ... Read More

In this article, we will learn about the importance of the FocusListener interface in Java. In Java, the FocusListener Interface plays an important role in making GUIs interactive and responsive. It enables the developer to monitor and respond to changes in focus in a Java-based application. FocusListener The focus events are generated whenever a component gains or loses keyboard focus. The Objects representing focus events are created from the FocusEvent Class. The corresponding listener interface for the FocusEvent class is the FocusListener interface. Each listener for FocusEvent can implement the FocusListener interface. Syntax The following is the syntax of the ... Read More

In this article, we will learn to sort the items of a JComboBox in Java. A JComboBox is a basic Swing component, and one of its common requirements is to show the items in sorted order. What is a JComboBox? A JComboBox is a subclass of the JComponent class, and it is a combination of a text field and a drop-down list from which the user can choose a value. A JComboBox can generate the ActionListener, ChangeListener, and ItemListener interfaces when the user actions with a combo box. Syntax The following is the syntax for JComboBox initialization: JComboBox comboBox ... Read More

In this article, we will learn to center-align the items of a JComboBox in Java. The default rendering of a JComboBox uses a JLabel for each item. JLabel's default alignment is left-justified, hence the misalignment. JComboBox A JComboBox is a subclass of the JComponent class, and it is a combination of a text field and a drop-down list from which the user can choose a value. A JComboBox can generate an ActionListener, ChangeListener, and an ItemListener when the user actions with a combo box. Center-Align the Items of a JComboBox By default, items in the JCombobox are left-aligned. We ... Read More

In this article, we will learn to display the line numbers inside a JTextArea in Java. When using text editors or code viewers in Java Swing applications, the showing of line numbers can greatly improve the user experience. What is a JTextArea? A JTextArea is a subclass of JTextComponent and it is a multi-line text component to display the text or allow the user to enter a text. 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(); By default, JTextArea does ... Read More